| 400 Men Overall 2021 to 53.0 | Head to Head Top 10 |
| Rank | Perf | | | PB | | Name | | Year | Coach | Club | Venue | Date | |
| UKA OLYMPIC STANDARD: 44.90 |
| 1 | 45.51 | | | 43.44 | | Matthew Hudson-Smith | | 5 | | Birchfield H | Clermont FL, USA | 4 Apr 21 |  |
| 1 | 45.51 | | | 44.23 | | Charlie Dobson | U23 | -1 | Benke Blomkvist | Colchester H | Coventry | 24 Apr 21 | |
| 3 | 45.57 | | | 45.08 | | Alex Haydock-Wilson | U23 | -1 | Earl Herbert | Windsor Slough Eton & Hounslow | Bromley | 13 Aug 21 | |
| 4 | 45.72 | | | 45.72 | PB | Edward Faulds | U20 | -5 | James Wright | Rugby & Northampton | Tallinn, EST | 16 Jul 21 | |
| 5 | 45.84 | | | 45.54 | | Joseph Brier | U23 | -1 | Matt Elias | Swansea | Oordegem, BEL | 29 May 21 | |
| 6 | 45.86 | | | 45.86 | PB | Jamal Rhoden-Stevens | | 5 | Donovan Reid | Shaftesbury Barnet | Palafrugell, ESP | 18 Sep 21 | |
| 7 | 45.89 | | | 45.64 | | Cameron Chalmers | | 2 | Matt Elias | Guernsey | Chorzow, POL | 29 May 21 | |
| 8 | 45.94 | | | 45.47 | | Efekemo Okoro | | 7 | Tony Hadley | Birchfield H | Sportcity | 18 Aug 21 | |
| 9 | 45.97 | | | 45.97 | PB | Kevin Metzger | | 2 | Stephen Ball | Sale Harriers Manchester | Nuneaton | 7 Aug 21 | |
| 10 | 46.05 | | | 46.05 | PB | Niclas Baker | | 5 | Piotr Spas | Crawley | Sportcity | 26 Jun 21 | |
 UK 10 TARGET: 46.10 |
| 11 | 46.27 | | | 46.20 | | Lee Thompson | | 2 | John Henson | Sheffield & Dearne | Watford | 12 Jun 21 | |
| 12 | 46.30 | | | 45.98 | | Michael Ohioze | | 4 | Dan Tomlin | Shaftesbury Barnet | Azusa CA, USA | 17 Apr 21 | |
| 13 | 46.35 | | | 44.54 | | Rabah Yousif | | 13 | Carol Williams | Newham & Essex Beagles | Šamorín, SVK | 2 Jun 21 | |
| 14 | 46.37 | | | 46.23 | | Owen Smith | | 5 | Matt Elias | Cardiff | Watford | 12 Jun 21 | |
| 15 | 46.4 | | | 46.75/46.4 | PB | Chris McAlister | | 4 | Marina Armstrong | Thames Valley | Eton | 28 Aug 21 | |
| 47.91 | i | | | | | | | | | Sportcity | 13 Feb 21 | |
| 16 | 46.51 | | | 46.51 | PB | James Williams | | 8 | Paul Waters | Liverpool H | Bedford | 18 Jul 21 | |
| 17 | 46.53 | | | 45.63 | | Ben Jefferies | U23 | -1 | | Bristol & West | Gulf Shores AL, USA | 28 May 21 | |
| 18 | 46.62 | i | | 46.16 | | Ethan Brown | U23 | -3 | Lloyd Cowan | Blackheath & Bromley | Lubbock TX, USA | 27 Feb 21 | |
| 47.15 | | | | | | | | | | Manhattan KS, USA | 15 May 21 | |
| 19 | 46.64 | | | 45.48 | | Charlie Carvell | U20 | -6 | Stuart Hamilton | Telford AC | Stretford | 8 May 21 | |
| 20 | 46.65 | | | 45.60 | | Lewis Davey | U23 | -2 | Lloyd Cowan | Newham & Essex Beagles | Stratford (CT) | 13 Jun 21 | |
| 21 | 46.75 | | | 46.15 | | Ben Higgins | U23 | -2 | | Sheffield & Dearne | Bromley | 13 Aug 21 | |
| 22 | 46.85 | | | 45.81 | | Toby Harries | | 1 | David Sadkin | Brighton Phoenix | Lee Valley | 25 Apr 21 | |
| 22 | 46.85 | | | 45.71 | | Brodie Young | U20 | -5 | James McMenemy | Airdrie Harriers | Bedford | 19 Jun 21 | |
| 24 | 46.87 | | | 46.87 | PB | Jason Hoyle | | 3 | Lloyd Cowan | Thames Valley | Bromley | 13 Aug 21 | |
| 25 | 46.97 | | | 44.70 | | Samuel Reardon | U20 | -5 | Nigel Stickings | Blackheath & Bromley | Bromley | 13 Aug 21 | |
| 26 | 47.03 | | | 45.60 | | Rio Mitcham | U23 | -1 | Leon Baptiste | Birchfield H | Nuneaton | 13 Jun 21 | |
| 27 | 47.07 | i | | 46.79 | | Thomas Somers | | 2 | Lloyd Cowan | Newham & Essex Beagles | Sportcity | 20 Feb 21 | |
| 28 | 47.08 | | | 46.17 | | Alex Knibbs | U23 | -1 | Nick Dakin | Amber Valley & Erewash | Bedford | 19 Jun 21 | |
| 28 | 47.08 | | | 46.02 | | Dan Putnam | | 8 | | Blackheath & Bromley | Dagenham | 30 Aug 21 | |
| 30 | 47.09 | | | 47.09 | PB | Aidan Leeson | U23 | -1 | Glyn Hawkes | Rugby & Northampton | Bedford | 19 Jun 21 | |
| 31 | 47.13 | | | 46.68 | | Alex Cooper | U20 | -4 | Grant Barker | Birchfield H | Bedford | 19 Jun 21 | |
| 32 | 47.14 | | | 47.10 | | Kyle Langford | | 3 | Jon Bigg | Shaftesbury Barnet | Stratford (CT) | 13 Jun 21 | |
| 33 | 47.17 | | | 47.17 | PB | Krishawn Aiken | | 4 | Chris Baillie | Shaftesbury Barnet | Lee Valley | 6 Jun 21 | |
| 34 | 47.20 | | | 46.21 | | Ben Snaith | | 4 | Clarence Callender | Newham & Essex Beagles | Peterborough | 31 Jul 21 | |
| 35 | 47.25 | | | 47.25 | PB | Joshua Faulds | U23 | -2 | Alex Currie | Shaftesbury Barnet | Stratford (CT) | 12 Sep 21 | |
| 36 | 47.27 | | | 46.56 | | Oliver Biddle | | 1 | Dale Garland | Worcester | Bedford | 17 Jul 21 | |
| 37 | 47.4 | | | 47.77/47.4 | PB | Isaac Osei-Tutu | | 1 | Simon Duberley | Windsor Slough Eton & Hounslow | Eton | 28 Aug 21 | |
| 47.81 | | | | | | | | | | Bromley | 6 Jun 21 | |
| 38 | 47.68 | | | 46.34 | | Grant Plenderleith | | 8 | David Lothian | Sheffield & Dearne | Stretford | 8 Jun 21 | |
| 39 | 47.71 | | | 47.71 | PB | Reuben Henry-Daire | U20 | -6 | Paul Herrington | Reading AC | Sportcity | 9 Jul 21 | |
| 40 | 47.72 | | | 47.72 | PB | Tyler Johnson | | 8 | Peter Irving | City of Plymouth | Stratford (CT) | 12 Sep 21 | |
| 41 | 47.73 | | | 46.79 | | Kyle Alexander | | 6 | | Giffnock North | Loughborough | 8 Sep 21 | |
| 42 | 47.74 | | | 44.45 | | Martyn Rooney | | 12 | Nick Dakin | Croydon | Gateshead | 13 Jul 21 | |
| 43 | 47.76 | | | 47.71 | | Jamal Clarke | | 3 | Piotr Spas | Windsor Slough Eton & Hounslow | Bedford | 17 Jul 21 | |
| 44 | 47.78 | | | 47.32 | | William Doyle | U23 | -3 | Roy Buchanan | Pitreavie | Princeton NJ, USA | 25 Apr 21 | |
| 44 | 47.78 | | | 47.36 | | Callum Dodds | U23 | -2 | Linford Christie | Enfield & Haringey | Dagenham | 24 Jul 21 | |
| 46 | 47.79 | | | 47.71 | | Mark Cottam | | 3 | Alex Currie | Bristol & West | Yate | 3 Jul 21 | |
| 47 | 47.81 | | | 47.81 | PB | Columba Blango T20/F20 | | 7 | Chris Zah | Shaftesbury Barnet | Tokyo, JPN | 31 Aug 21 | |
| 48 | 47.82 | | | 46.76 | | Ben Pattison | U23 | -3 | Dave Ragan | Basingstoke & Mid Hants | Loughborough | 12 May 21 | |
| 49 | 47.83 | | | 46.60 | | Thomas Evans | U23 | -2 | Nick Dakin | Newark AC | Bedford | 17 Jul 21 | |
| 50 | 47.84 | | | 47.84 | PB | Steffan Dylan Jones | U23 | -3 | Darrell Maynard | Swansea | Bedford | 19 Jun 21 | |
| 51 | 47.85 | | | 47.85 | PB | Matthew Overall | | 3 | Paul McKeown | Crawley | Stratford (CT) | 12 Sep 21 | |
| 52 | 47.89 | | | 47.03 | | Elliott Powell | | 3 | Tony Hadley | Birchfield H | Birmingham (U) | 9 Jun 21 | |
| 53 | 47.91 | | | 46.71 | | Sam Hazel | | 3 | Jane Dixon | Shaftesbury Barnet | Hendon | 31 Jul 21 | |
| 54 | 47.95 | | | 47.95 | PB | Conor Murphy | U23 | -3 | Steven Munday | Medway & Maidstone | Cullowhee NC, USA | 1 May 21 | |
| 54 | 47.95 | | | 46.80 | | Emmanuel Agyare | U23 | -3 | | Enfield & Haringey | Bedford | 17 Jul 21 | |
| 56 | 48.00 | | | 47.05 | | Michael Shonibare | U23 | -2 | Clarence Callender | Victoria Park & Tower Hamlets | Dagenham | 26 Jun 21 | |
| 57 | 48.0 | | | 47.14 | | Samuel Clarke | U23 | -2 | Robert Smith | Cambridge & Coleridge | Bury St. Edmunds | 5 Sep 21 | |
| 58 | 48.01 | | | 48.01 | PB | Adam Booth | U20 | -4 | Francis Baker | Poole AC | Tonbridge | 6 Jun 21 | |
| 59 | 48.05 | | | 48.05 | PB | Lennox Thompson | | 6 | | Newham & Essex Beagles | Dagenham | 24 Jul 21 | |
| 60 | 48.06 | | | 48.00 | | Guy Learmonth | | 7 | | Lasswade | Grangemouth | 14 Aug 21 | |
| 61 | 48.08 | | | 47.02i | | Seamus Derbyshire | U23 | -2 | Nick Dakin | City of Stoke | Nuneaton | 16 May 21 | |
| 62 | 48.12 | | | 48.06 | | Alexander Daley | | 3 | Alex Currie | Bristol & West | Nuneaton | 11 Apr 21 | |
| 62 | 48.12 | | | 47.86 | | Jordan Broome | | 3 | Ronnie Williams | Sale Harriers Manchester | Nuneaton | 16 May 21 | |
| 64 | 48.13 | | | 48.13 | PB | Morgan Webster | U23 | -1 | James Webster | Shaftesbury Barnet | Bedford | 19 Jun 21 | |
| 65 | 48.22 | | | 48.22 | PB | Nick Stewart | | 1 | Ryan Freckleton | Enfield & Haringey | Bromley | 24 May 21 | |
| 66 | 48.36 | | | 45.42 | | Delano Williams | | 6 | | Enfield & Haringey | Kingston, JAM | 27 Feb 21 | |
| 67 | 48.40 | | | 47.35 | | Jack Turner | U23 | -3 | Francis Baker | Exeter | Murfreesboro TN, USA | 13 May 21 | |
| 67 | 48.40 | | | 48.40 | PB | Mark Roberts | U20 | -5 | Mark Bleasdale | Liverpool Pembroke Sefton | Sportcity | 9 Jul 21 | |
| 69 | 48.41 | | | 48.41 | PB | Moyo Sargent | U20 | -4 | Sue Keen | Eastbourne | Bedford | 19 Jun 21 | |
| 69 | 48.41 | | | 45.34 | | Dwayne Cowan | V35 | 14 | Lloyd Cowan | Hercules Wimbledon | Sportcity | 25 Jun 21 | |
| 71 | 48.44 | | | 48.44 | PB | Alex Botterill | U23 | -2 | Andrew Henderson | City of York | Sportcity | 29 May 21 | |
| 71 | 48.44 | | | 48.44 | PB | Lewis Thorn | | 1 | John Henson | Braintree | Bedford | 17 Jul 21 | |
| 73 | 48.45 | | | 48.07 | | Rory Keen | U23 | -2 | Tony Hadley | Sale Harriers Manchester | Birmingham (U) | 21 Apr 21 | |
| 74 | 48.53 | | | 48.53 | PB | Piers Copeland | | 1 | Bob Smith | Wimborne | Cardiff | 14 Aug 21 | |
| 75 | 48.54 | | | 48.33 | | Ben Wells | | 2 | Dale Garland | Yate | Yate | 20 Jun 21 | |
| 76 | 48.55 | | | 48.55 | PB | Morgan Amed | U23 | -1 | Stewart Marshall | Coventry | Birmingham (U) | 12 May 21 | |
| 77 | 48.60 | | | 47.29 | | Robert Shipley | | 3 | Max Coleby | City of York | Sportcity | 27 May 21 | |
| 78 | 48.61 | i# | | 46.40 | | Owen Richardson | | 1 | John Davis | Basingstoke & Mid Hants | Allendale MI, USA | 5 Feb 21 | |
| 49.73 | | | | | | | | | | Orlando FL, USA | 24 Apr 21 | |
| 79 | 48.62 | | | 48.62 | PB | Louis Menzies Walker | U20 | -4 | Nat Senior | Victoria Park & Tower Hamlets | Bedford | 19 Jun 21 | |
| 80 | 48.63 | | | 48.63 | PB | Calvin Smith | U17 | -6 | Nathan Rogers | Shaftesbury Barnet | Hendon | 31 Jul 21 | |
| 81 | 48.65 | | | 48.65 | PB | Junior George | | 8 | John Henson | Holmfirth | York | 19 Jun 21 | |
| 82 | 48.68 | | | 48.67 | | Jason Nicholson | U23 | -1 | Janice Kaufman | Gateshead | Jarrow | 21 Jul 21 | |
| 83 | 48.70 | | | 48.70 | PB | Kema Egbunike | | 6 | Linford Christie | Harrow | Dagenham | 30 Aug 21 | |
| 84 | 48.71 | | | 48.71 | PB | Ethan Flaherty | U20 | -4 | | Liverpool H | Stretford | 8 Jun 21 | |
| 85 | 48.72 | | | 48.72 | PB | Luca Bigg | U23 | -3 | Jon Bigg | Brighton Phoenix | Worthing | 1 Jun 21 | |
| 86 | 48.74 | | | 48.44 | | Pablo Seema Roca | U20 | -5 | Jay Galley | Blackheath & Bromley | Bromley | 6 Jun 21 | |
| 87 | 48.77 | | | 47.62 | | Jack Higgins | U23 | -3 | Jonathan Tilt | Southampton | Eton | 7 Aug 21 | |
| 87 | 48.77 | | | 48.77 | PB | Stephen Johnston | U20 | -4 | Ricky Miell | Kilbarchan | Grangemouth | 14 Aug 21 | |
| 89 | 48.80 | | | 48.80 | PB | Jose Duhaney | U23 | -3 | Sharon Morris | Birchfield H | Bedford | 17 Jul 21 | |
| UK 100 TARGET: 48.80 |
| 90 | 48.82 | | | 47.74 | | Ollie Smith | | 6 | Roy Dickens | Harrow | Bromley | 24 May 21 | |
| 91 | 48.85 | | | 48.85 | PB | Jeriel Quainoo | U20 | -5 | Ryan Freckleton | Blackheath & Bromley | Lee Valley | 10 Apr 21 | |
| 92 | 48.87 | | | 48.87 | PB | Cal McLennan | U23 | -1 | Rafer Joseph | Edinburgh AC | Bedford | 29 May 21 | |
| 93 | 48.89 | | | 48.57 | | Ewan Wood | U20 | -4 | David Hull | Tonbridge | Bromley | 13 Aug 21 | |
| 94 | 48.90 | | | 47.82 | | Matthew Buckner | U23 | -2 | Tony Hadley | Bracknell AC | Bedford | 19 Jun 21 | |
| 95 | 48.9 | | | 48.11 | | Allan Hamilton | | 7 | John Scott | Sale Harriers Manchester | Sportcity | 6 Jun 21 | |
| 95 | 48.9 | | | 47.60i | | Cameron Bailey | U23 | -2 | Mike Bennett | Ipswich | Cambridge | 11 Jul 21 | |
| 97 | 48.92 | | | 48.32 | | Reece Middleton | | 3 | Stewart Marshall | Coventry | Birmingham (U) | 12 May 21 | |
| 98 | 48.93 | | | 48.93 | PB | Joshua Hale | U20 | -4 | Simon King | BRAT | Nuneaton | 13 Jun 21 | |
| 99 | 48.94 | | | 48.94 | PB | Joe Bacon | U23 | -2 | Laurence Garnham | Bournemouth | Plymouth | 1 Aug 21 | |
| 100 | 48.97 | | | 47.14 | | Peter Shand | | 8 | Tony Hadley | Birchfield H | Nuneaton | 1 May 21 | |
| 100 | 48.97 | | | 48.97 | PB | Sam Howell | U20 | -5 | | Cheltenham | Bedford | 19 Jun 21 | |
| 102 | 49.0 | | | 49.19/49.0 | PB | Steven Mackay | U23 | -1 | Tyler Johnson | Jersey | St. Clement | 19 Aug 21 | |
| 103 | 49.05 | | | 49.05 | PB | Aidan Brady | U20 | -4 | Henry Gray | Livingston | Aberdeen | 29 Aug 21 | |
| 104 | 49.08 | | | 46.93 | | Ben Hawkes | U23 | -2 | Matt Elias | Leamington | Nuneaton | 13 Jun 21 | |
| 105 | 49.11 | | | 49.11 | PB | Jack Dickson | U20 | -5 | Richard Vassall | Kingston & Poly | Kingston | 3 Jul 21 | |
| 105 | 49.11 | | | 48.86 | | Benjamin Schofield | U23 | -2 | Janice Kaufman | Gateshead | Nuneaton | 7 Aug 21 | |
| 107 | 49.12 | | | 46.55 | | Connor Neal | U20 | -4 | | Thanet AC | Lee Valley | 25 Apr 21 | |
| 107 | 49.12 | | | 46.59 | | Jake Minshull | U17 | -6 | | Coventry | Coventry | 25 Jul 21 | |
| 109 | 49.19 | | | 47.58 | | Kieran Eland | | 2 | Iain Presnell | Tonbridge | Tonbridge | 6 Jun 21 | |
| 110 | 49.20 | | | 49.03 | | Max Schopp | | 3 | Laura Turner-Alleyne | Harrow | Lee Valley | 25 Apr 21 | |
| 111 | 49.24 | | | 48.53 | | Calum Mackenzie | U17 | -6 | Stephen Wallace | Cumbernauld | Derby | 25 Sep 21 | |
| 112 | 49.25 | | | 48.74 | | Charlie Roe | | 7 | Stewart Marshall | Coventry | Sportcity | 27 May 21 | |
| 112 | 49.25 | | | 48.25 | | James Finney | | 3 | David Feeney | Sheffield & Dearne | Horspath | 3 Jul 21 | |
| 114 | 49.26 | | | 48.90 | | Charlie Baldwin | | 4 | | Worthing | Stratford (CT) | 13 Jun 21 | |
| 115 | 49.28 | | | 48.69 | | Reece Ingley | | 7 | Stephen Ball | Trafford | Stretford | 3 Apr 21 | |
| 116 | 49.30 | | | 48.07 | | George Seery | U20 | -5 | Jack Green 🐊 | Thanet AC | Gillingham | 7 Aug 21 | |
| 117 | 49.3 | | | 48.08 | | Sammy Ball | U17 | -6 | Michael Dyer | Reading AC | Lee Valley | 26 Jun 21 | |
| 50.25 | | | | | | | | | | Sportcity | 28 Aug 21 | |
| 118 | 49.32 | | | 47.26 | | Jacob Campbell | U23 | -2 | John Denford | Enfield & Haringey | Lee Valley | 30 Aug 21 | |
| 119 | 49.34 | | | 49.34 | PB | Dominic Lamb | | 1 | John Henson | Sheffield & Dearne | Stretford | 22 Jun 21 | |
| 120 | 49.37 | | | 49.37 | PB | Philip Kastner | U23 | -3 | Adrian Hemery | Walton | Montpellier, FRA | 29 May 21 | |
| 121 | 49.38 | | | 49.38 | PB | Nicolas Gerome | U23 | -1 | Rafer Joseph | Basingstoke & Mid Hants | Montpellier, FRA | 29 May 21 | |
| 122 | 49.39 | | | 49.39 | PB | Decarie Davies | U20 | -4 | | Shaftesbury Barnet | Hendon | 5 Sep 21 | |
| 123 | 49.40 | | | 49.40 | PB | Aaron Jolly | U20 | -4 | Helen Patricia James | Cardiff | Cardiff | 14 Aug 21 | |
| 124 | 49.4 | | | 47.73 | | Peter Curtis | U23 | -2 | Dale Garland | Guernsey | Oxford | 15 May 21 | |
| 125 | 49.42 | | | 48.79 | | Jakob Hamilton | U20 | -5 | Lawson Cochrane | Willowfield | Belfast | 18 Jul 21 | |
| 126 | 49.43 | | | 47.93 | | Nathaniel Dyas | U20 | -6 | Mark Fowler | Hallamshire | Sportcity | 9 Jul 21 | |
| 127 | 49.44 | | | 49.44 | PB | Tom Wood | | 1 | Geoffrey Barraclough | City of York | Sheffield | 1 Aug 21 | |
| 128 | 49.46 | | | 47.52 | | Hakan Dalbal | U23 | -2 | | Longwood | York | 21 Aug 21 | |
| 129 | 49.48 | | | 49.46 | | Sam Tyers | U20 | -4 | Carol Williams | Middlesbrough (Mandale) | Leigh | 12 Jun 21 | |
| 130 | 49.49 | | | 49.25 | | Niall Carney | | 2 | | Shaftesbury Barnet | Kettering | 31 May 21 | |
| 130 | 49.49 | | | 49.49 | PB | Archie Sloan | U20 | -5 | | Worthing | Crawley | 19 Jun 21 | |
| 130 | 49.49 | | | 46.51 | | Isaac Cory | U20 | -4 | Sandra Woodman | Yate | Yate | 27 Jun 21 | |
| 133 | 49.50 | | | 49.50 | PB | James McCulloch | U20 | -5 | David Buckett | Crawley | Sportcity | 9 Jul 21 | |
| 133 | 49.50 | | | 49.18 | | Craig Cox | | 13 | | Crawley | Stratford (CT) | 12 Sep 21 | |
| 135 | 49.5 | | | 47.61 | | Tom Ainsworth | | 1 | Matthew Hargreaves | Tamworth | Burton | 20 Jun 21 | |
| 136 | 49.51 | | | 49.06 | | Ben Sinclair | U17 | -7 | | Manx | Sportcity | 10 Jul 21 | |
| 136 | 49.51 | | | 49.51 | PB | Aidan Simpson | U20 | -4 | Nigel Reynolds | Dundee Hawkhill | Grangemouth | 14 Aug 21 | |
| 138 | 49.53 | | | 49.53 | PB | Jamie Carrott | U17 | -7 | Joseph McDonnell ☘️ | Charnwood | Loughborough | 16 Jun 21 | |
| 138 | 49.53 | | | 47.78i | | Bailey Stickings | | 1 | Nigel Stickings | Blackheath & Bromley | Eltham | 4 Aug 21 | |
| 140 | 49.55 | | | 47.39 | | Matthew Agnimel | U23 | -2 | Trevor Wells | Havering | Bromley | 13 Aug 21 | |
| 141 | 49.56 | | | 47.47 | | Evan Blackman | U23 | -3 | Alan Wymant | Corby | Nuneaton | 11 Apr 21 | |
| 141 | 49.56 | | | 48.32 | | Angus Harrington | U23 | -3 | | Blackheath & Bromley | Bromley | 24 May 21 | |
| 143 | 49.57 | | | 49.34 | | Mitchell Lawrence | U23 | -3 | | Southend | Aberdare | 15 May 21 | |
| 143 | 49.57 | | | 48.72 | | Matthew Waterfield | U23 | -2 | | Morpeth | Leigh | 12 Jun 21 | |
| 143 | 49.57 | | | 49.57 | PB | Gerald Matthew | | 2 | Jane Dixon | Shaftesbury Barnet | Kettering | 21 Aug 21 | |
| 146 | 49.60 | | | 49.60 | PB | Ryan Gorman | | 1 | Karen Buck | City of York | York | 19 Jun 21 | |
| 146 | 49.60 | | | 46.19 | | Callum Baird | U20 | -5 | | Ballymena & Antrim | Belfast | 18 Jul 21 | |
| 146 | 49.60 | | | 48.82 | | Oliver Adnitt | U20 | -5 | John Brant | Kingston upon Hull | Bedford | 18 Sep 21 | |
| 149 | 49.6 | | | 48.85 | | Dominic Walton | | 6 | John Wood | Blackburn | Stretford | 1 Aug 21 | |
| 150 | 49.61 | | | 49.53 | | Harry Maslen | | 3 | Sam Stanislaus | Ilkley | Bedford | 29 May 21 | |
| 150 | 49.61 | | | 48.53 | | Akeem Akintokun | | 6 | Vespa Ellis | Havering | Gillingham | 7 Aug 21 | |
| 152 | 49.63 | | | 48.37 | | Joshua Snook | U23 | -1 | | Yate | Vermillion SD, USA | 7 May 21 | |
| 153 | 49.64 | | | 49.23 | | Tom Gaunce | U17 | -7 | Jake Awe | Dacorum | Bromley | 24 May 21 | |
| 153 | 49.64 | | | 48.14 | | Henry Fisher | U20 | -4 | David Liston | Blackheath & Bromley | Stratford (CT) | 13 Jun 21 | |
| 155 | 49.67 | | | 49.67 | PB | Ben Murphy | | 2 | Mark Hookway | Tonbridge | Tonbridge | 6 Jun 21 | |
| 155 | 49.67 | | | 49.67 | PB | Leon Bradshaw | U20 | -5 | Neil Dodson | Windsor Slough Eton & Hounslow | Eton | 27 Jun 21 | |
| 155 | 49.67 | | | 47.79 | | Sam Talbot | U23 | -1 | Toni Minichiello | Sheffield & Dearne | Sportcity | 28 Aug 21 | |
| 158 | 49.68 | | | 47.25 | | Cameron McGregor | U20 | -5 | James Wright | Rugby & Northampton | Loughborough | 19 May 21 | |
| 158 | 49.68 | | | 48.52i | | David Chapman | U20 | -5 | John Smith | Sheffield & Dearne | Sportcity | 3 Jul 21 | |
| 158 | 49.68 | | | 49.05 | | Billy Matthews | U23 | -2 | Raymond Twentyman | Liverpool Pembroke Sefton | Hendon | 10 Jul 21 | |
| 161 | 49.69 | | | 48.83 | | Joseph Rogers | | 1 | Lewis Moses | Halesowen | Kettering | 3 Aug 21 | |
| 161 | 49.69 | i | | 48.02 | | Bayleigh Lawton | U20 | -6 | Charlene Thomas | Spenborough | Sheffield | 29 Dec 21 | |
| 50.24 | | | | | | | | | | Hull | 15 Aug 21 | |
| 163 | 49.70 | | | 46.96 | | Greg Louden | | 7 | Kirk Smith | Lasswade | Grangemouth | 14 Aug 21 | |
| 164 | 49.71 | | | 49.71 | PB | Noah Ernest | U20 | -5 | Darrell Maynard | Cardiff Archers | Aberdare | 15 May 21 | |
| 164 | 49.71 | | | 49.71 | PB | Jack Gosden | U20 | -5 | | Middlesex Schs | Sportcity | 9 Jul 21 | |
| 166 | 49.74 | | | 47.80 | | Emmanuel Sosanya | | 1 | Coral Nourrice | Newham & Essex Beagles | Lee Valley | 6 Jun 21 | |
| 166 | 49.74 | | | 49.74 | PB | David Locke | U20 | -4 | Sonia McGeorge | Cardiff | Aberdare | 5 Sep 21 | |
| 168 | 49.76 | | | 49.76 | PB | David Mould | | 12 | | Bromsgrove & Redditch | Nuneaton | 13 Jun 21 | |
| 169 | 49.8 | | | 49.06 | | Adam Fox | U20 | -6 | | Kingston upon Hull | Cleckheaton | 19 Jun 21 | |
| 49.82 | | | | | | | | | | Hull | 25 Jul 21 | |
| 169 | 49.8 | | | 48.93 | | Harry Crosby | U20 | -5 | Andrew Fisher | Winchester | Guildford | 27 Jun 21 | |
| 169 | 49.8 | | | 48.71 | | Samuel Jones | | 2 | Deborah Steer | St. Albans AC | Hemel Hempstead | 11 Jul 21 | |
| 172 | 49.81 | | | 47.74 | | Lewis Collins | | 6 | Iain Presnell | Tonbridge | Eltham | 23 Jun 21 | |
| 172 | 49.81 | | | 49.23 | | Finlay Hutchinson | U20 | -6 | Trevor Muxlow | Notts | Sportcity | 3 Jul 21 | |
| 172 | 49.81 | | | 49.01 | | Tor Bennett-Williams | | 1 | Howard Court | Birchfield H | Nuneaton | 31 Jul 21 | |
| 175 | 49.82 | | | 49.82 | PB | Jai Sispal | U20 | -5 | Chris Jackson | Leamington | Coventry | 25 Jul 21 | |
| 176 | 49.83 | | | 49.77 | | Callum Letham | U23 | -1 | Kevin Reynolds | Dundee Hawkhill | Wigan | 7 Aug 21 | |
| 176 | 49.83 | | | 49.26 | | Cameron Duff | U23 | -3 | John Smith | Sale Harriers Manchester | Wigan | 7 Aug 21 | |
| 178 | 49.85 | | | 48.88 | | Joshua Pearson | U20 | -4 | Lesley Pearson | Windsor Slough Eton & Hounslow | Harrow | 13 May 21 | |
| 178 | 49.85 | | | 47.07 | | Maranga Mokaya | | 3 | Emma Louise Hooper | Notts | Kettering | 31 May 21 | |
| 178 | 49.85 | | | 49.85 | PB | Jaiden Aaron | U23 | -2 | Jake Awe | Harrow | Eltham | 14 Jul 21 | |
| 181 | 49.86 | | | 48.99 | | Ollie Thorner | U23 | -3 | Toby Stevenson | Wells City | Los Angeles CA, USA | 14 May 21 | |
| 181 | 49.86 | | | 48.12 | | Samuel Day | | 2 | | Cambridge Uni | Woodford | 22 May 21 | |
| 183 | 49.87 | | | 48.42 | | Jacob Lamboll | U20 | -5 | Laurence Garnham | City of Plymouth | Exeter | 20 Jun 21 | |
| 183 | 49.87 | | | 48.85 | | Pyers Lockwood | U20 | -4 | Trevor Simcox | Lewes | Dagenham | 26 Jun 21 | |
| 185 | 49.9 | | | 48.93 | | Daniel Joyce | U20 | -5 | Peter Venus | Tynedale | Whitley Bay | 22 May 21 | |
| 185 | 49.9 | | | 48.41 | | Jonathan Knox | U20 | -4 | Ronnie Williams | Coventry | Sutton Coldfield | 27 Jun 21 | |
| 50.36 | | | | | | | | | | Kettering | 31 May 21 | |
| 185 | 49.9 | | | 50.98i/49.9 | PB | Jacob Aubrey | U23 | -2 | | Helm Hill | Carlisle | 1 Aug 21 | |
| 188 | 49.93 | | | 47.73 | | Thomas Hockley | U20 | -6 | Katy Odell | Southampton | Worthing | 1 Jun 21 | |
| 188 | 49.93 | | | 48.62 | | Kareem Selman-Jackson | | 1 | Conrad Williams | Belgrave | Milton Keynes | 28 Aug 21 | |
| 190 | 49.94 | | | 46.82 | | Tom Hunter | U20 | -5 | Rodger Hughes | Windsor Slough Eton & Hounslow | Eton | 25 Jul 21 | |
| 191 | 49.95 | | | 49.95 | PB | Joshua Saunders | U20 | -5 | Eliska Binks | Charnwood | Leicester | 31 Jul 21 | |
| 192 | 49.96 | | | 47.88 | | Adam Clayton | U23 | -2 | Ryan McAllister | Giffnock North | Columbia MO, USA | 20 Mar 21 | |
| 192 | 49.96 | | | 48.08 | | Psalm Roberts-Nash | U23 | -1 | Howard Court | Birchfield H | Nuneaton | 13 Jun 21 | |
| 194 | 49.99 | | | 47.50 | | Jack Hocking | | 1 | Mike Bennett | Trafford | Stretford | 9 May 21 | |
| 195 | 50.00 | | | 50.00 | PB | Will Critchley | U23 | -3 | | Blackpool, Wyre & Fylde | Stretford | 6 Jul 21 | |
| 195 | 50.00 | | | 50.00 | PB | Harry Ware | U17 | -6 | Ken Spencer | Bracknell AC | Bracknell | 11 Jul 21 | |
| 195 | 50.00 | | | 48.02 | | Declan Gall | U23 | -1 | Francis Smith | Woodford Green Essex Ladies | Dunfermline | 12 Sep 21 | |
| 198 | 50.0 | | | 50.51/50.0 | PB | Harrison Chapman | U23 | -3 | Vespa Ellis | Basildon | Basildon | 11 Sep 21 | |
| 51.17 | | | | | | | | | | Chelmsford | 31 Jul 21 | |
| 199 | 50.02 | | | 50.02 | PB | Will Farndale | U20 | -5 | David Rice | Hertford & Ware | Lee Valley | 20 Jun 21 | |
| 200 | 50.05 | | | 48.80 | | Thomas Baines | U23 | -2 | | Bristol & West | Yate | 3 Jul 21 | |
| 201 | 50.06 | | | 47.73 | | Onyeka Okoh | U17 | -6 | Jade Harding | Chelmsford | Chelmsford | 9 Jun 21 | |
| 201 | 50.06 | | | 48.89 | | Darcy Sullivan | U20 | -5 | Jade Harding | Chelmsford | Bedford | 28 Aug 21 | |
| 203 | 50.07 | | | 49.99/49.9 | | Benjamin Verbickas | U20 | -5 | Dominic Bradley | Crewe & Nantwich | Leigh | 12 Jun 21 | |
| 203 | 50.07 | | | 49.41 | | Joseph Dickenson | U23 | -3 | Leon Baptiste | Woodford Green Essex Ladies | Dagenham | 24 Jul 21 | |
| 205 | 50.09 | | | 50.09 | PB | Iestyn Williams | U23 | -3 | Carol Jones | Carmarthen | Newport | 26 Jun 21 | |
| 206 | 50.1 | | | 48.83 | | Stefan O'Loughnane | U20 | -6 | Dave Ragan | Basingstoke & Mid Hants | Basingstoke | 1 May 21 | |
| 50.23 | | | | | | | | | | Tonbridge | 6 Jun 21 | |
| 206 | 50.1 | | | 50.90/50.1 | PB | Joel Evans | U20 | -5 | Norma Harris | Stevenage & North Herts | Peterborough | 6 Jun 21 | |
| 51.04 | | | | | | | | | | Hendon | 5 Sep 21 | |
| 206 | 50.1 | | | 49.58/49.5 | | William Thorley | U20 | -4 | Paul Gripton | Bromsgrove & Redditch | Stourport | 8 Aug 21 | |
| 50.91 | | | | | | | | | | Stourport | 31 Jul 21 | |
| 209 | 50.13 | | | 50.13 | PB | Bradley Eisnor | | 3 | Julia Machin | Brighton & Hove | Worthing | 1 Jun 21 | |
| 209 | 50.13 | | | 50.13 | PB | Reece Harriott | U20 | -4 | Patrick Gahagan | Havering | Hornchurch | 27 Jun 21 | |
| 209 | 50.13 | | | 50.13/50.0 | PB | Ben Knowles | U20 | -5 | Paul Allan | Pitreavie | Hull | 25 Jul 21 | |
| 212 | 50.14 | | | 50.14 | PB | William Ritchie-Moulin | | 3 | Julie Coleby | Birchfield H | Jarrow | 21 Jul 21 | |
| 212 | 50.14 | | | 50.14 | PB | Laurie Sutcliffe | U20 | -6 | | Windsor Slough Eton & Hounslow | Milton Keynes | 31 Jul 21 | |
| 212 | 50.14 | | | 50.14 | PB | William Onek | | 10 | Norman Poole | Sale Harriers Manchester | Liverpool | 28 Aug 21 | |
| 215 | 50.19 | | | 50.19 | PB | Noah Friend | | 1 | | Tonbridge | Basingstoke | 3 Jul 21 | |
| 216 | 50.20 | | | 48.78 | | Jaiden Gaston | U20 | -5 | Chris Zah | Victoria Park & Tower Hamlets | Bromley | 24 May 21 | |
| 216 | 50.20 | | | 49.64 | | Ewan Purves | U20 | -6 | Henry Gray | Edinburgh AC | Grangemouth | 18 Jul 21 | |
| 216 | 50.20 | | | 50.20 | PB | George Vaughan | | 1 | Mike McFarlane | Woodford Green Essex Ladies | Woodford | 27 Jul 21 | |
| 219 | 50.2 | | | 49.63 | | Mark Holliman | | 1 | Chris Baillie | North Ayrshire | Sportcity | 6 Jun 21 | |
| 50.88 | | | | | | | | | | Kilmarnock | 8 May 21 | |
| 219 | 50.2 | | | 51.86/50.2 | PB | Kyle Corbin | U20 | -5 | Catherine Muth | Birchfield H | Sutton Coldfield | 27 Jun 21 | |
| 51.86 | | | | | | | | | | Birmingham (U) | 9 Jun 21 | |
| 219 | 50.2 | | | 50.95/50.2 | PB | Martyn Reynolds | V40 | 18 | | Hastings AC | Hastings | 14 Aug 21 | |
| 222 | 50.21 | | | 49.62 | | Ciaran Dunnion | | 5 | Jonathan Tilt | Southampton | Southampton | 16 May 21 | |
| 222 | 50.21 | | | 48.18 | | Isaac Ogunlade | | 8 | Chris Zah | Herne Hill | Stratford (CT) | 12 Sep 21 | |
| 222 | 50.21 | | | 48.75 | | Victor Nutakor | | 12 | Clarence Callender | Newham & Essex Beagles | Bromley | 22 Sep 21 | |
| 225 | 50.22 | | | 48.46i | | Kristian Samwell-Nash | U20 | -4 | Stella Bandu | Ashford AC | Eltham | 27 Jun 21 | |
| 225 | 50.22 | | | 50.22 | PB | Stewart Clark | | 6 | Eddie McKenna | Banchory Stonehaven | Grangemouth | 18 Jul 21 | |
| 225 | 50.22 | | | 49.91 | | Aaron Carter | | 4 | | Crawley | Hendon | 21 Aug 21 | |
| 228 | 50.23 | | | 50.23 | PB | Hanif Henry | | 2 | | Orion | Dagenham | 26 Jun 21 | |
| 229 | 50.25 | | | 49.80/49.2 | | Stewart Greenhalgh | U20 | -4 | Paul Gripton | Bromsgrove & Redditch | Birmingham (U) | 9 Jun 21 | |
| 230 | 50.27 | | | 50.27 | PB | Sam Wiggins | U23 | -2 | Nadeem Shaikh | Shaftesbury Barnet | Hendon | 28 Aug 21 | |
| 231 | 50.29 | | | 50.29 | PB | Esam Aftab | U20 | -6 | Derek Fraser | Trafford | Leigh | 12 Jun 21 | |
| 231 | 50.29 | | | 50.29 | PB | Lewis Thomson | U17 | -6 | Francis Smith | Perth Strathtay | Derby | 25 Sep 21 | |
| 233 | 50.30 | | | 49.64/48.6 | | Andre Wright | | 8 | Clarence Callender | Medway & Maidstone | Dagenham | 30 Aug 21 | |
| 234 | 50.3 | | | 49.35 | | Maximilian Buckley | U23 | -2 | Adrian Hemery | Thames Valley | Oxford | 15 May 21 | |
| 50.91 | | | | | | | | | | Lee Valley | 4 Jul 21 | |
| 235 | 50.31 | | | 47.96 | | Joel McFarlane | U23 | -2 | John Mcfarlane | Central | San Antonio TX, USA | 15 Apr 21 | |
| 235 | 50.31 | | | 49.34 | | James McClafferty | U23 | -2 | | Law | Grangemouth | 14 Aug 21 | |
| 237 | 50.33 | | | 49.53 | | Tobie Watson | U20 | -5 | Anthony Pitt | Birchfield H | Coventry | 25 Jul 21 | |
| 238 | 50.34 | | | 46.37 | | Tom Druce | | 13 | | Guernsey | St. Peter Port | 12 Sep 21 | |
| 239 | 50.36 | | | 46.94 | | Michael Fagbenle | U23 | -3 | Christopher Harris | Bexley | Harrow | 13 May 21 | |
| 240 | 50.37 | | | 50.37 | PB | Adam Mohamed | U23 | -2 | | Trafford | Stretford | 3 Apr 21 | |
| 240 | 50.37 | | | 50.37 | PB | Joel Vernon | U20 | -5 | Toni Minichiello | Hallamshire | Sheffield | 18 Apr 21 | |
| 242 | 50.38 | | | 49.68 | | Luigi Palmieri | U23 | -2 | Lee Bowker | Ipswich | Kettering | 31 May 21 | |
| 242 | 50.38 | | | 50.29 | | Scott Gunning | | 2 | Stewart Marshall | Coventry | Nuneaton | 13 Jun 21 | |
| 244 | 50.39 | | | 49.76 | | Muiris Egan | | 3 | | Bournemouth | Zaragoza, ESP | 8 May 21 | |
| 245 | 50.40 | | | 50.40 | PB | Matthew Marven | U17 | -6 | | Dacorum | Sportcity | 10 Jul 21 | |
| 246 | 50.4 | | | 48.31 | | Nicholas Pryce | | 7 | Joe Caines | Royal Sutton Coldfield | Birmingham (U) | 20 Jun 21 | |
| 246 | 50.4 | | | 50.41/50.4 | PB | Theodore Copestake | U20 | -5 | | Newport H | Stourport | 20 Jun 21 | |
| 50.41 | | | | | | | | | | Yate | 27 Jun 21 | |
| 246 | 50.4 | | | 49.38/49.3 | | Peter Irving | V35 | 16 | Andrew Winnie | Jersey | St. Clement | 19 Aug 21 | |
| 246 | 50.4 | | | 50.00 | | Elliot Savage | U17 | -6 | Norman Poole | Sale Harriers Manchester | Leigh | 5 Sep 21 | |
| 250 | 50.41 | | | 48.14i | | Harry Ross-Hughes | U20 | -6 | Joseph Green | Wirral | Leigh | 12 Jun 21 | |
| 250 | 50.41 | | | 50.41 | PB | Myles Kelly-Hyatt | | 1 | | Orion | Dagenham | 24 Jul 21 | |
| 252 | 50.42 | | | 49.09 | | Samuel Mowa | U17 | -8 | | Croydon | Kingston | 22 Aug 21 | |
| 253 | 50.43 | | | 47.59 | | Joel Richardson | | 6 | Stephen Ball | Trafford | Stretford | 9 May 21 | |
| 254 | 50.46 | | | 49.11 | | Bobby Laurenson | U23 | -2 | Martin Leyland | Shetland | Lerwick | 18 Jul 21 | |
| 254 | 50.46 | | | 49.45 | | Kit Oliver-Stevens | U20 | -4 | | Exeter | Tavistock | 15 Aug 21 | |
| 256 | 50.47 | | | 50.47 | PB | Samuel Shippey | U20 | -6 | David Smith | Colchester H | Horspath | 11 Sep 21 | |
| 257 | 50.48 | | | 50.38 | | Sean Garmory | | 4 | Tim Needham | Peterborough & Nene Valley | Bedford | 28 Aug 21 | |
| 257 | 50.48 | | | 48.06 | | Harry Kendall | | 3 | David Hull | Tonbridge | Erith | 18 Sep 21 | |
| 259 | 50.5 | | | 49.52 | | Amari Kamali-Turner | U20 | -4 | Kes Salmon | Manchester H | Leigh | 1 Aug 21 | |
| 51.12 | | | | | | | | | | Stretford | 21 Aug 21 | |
| 259 | 50.5 | | | 48.58 | | Harrison Pocock | | 3 | Ann Hayter | City of Portsmouth | Portsmouth | 30 Aug 21 | |
| 50.72 | | | | | | | | | | Southampton | 11 Sep 21 | |
| 259 | 50.5 | | | 47.93 | | Dylan Purton | U17 | -7 | Steven Munday | Medway & Maidstone | Ashford | 11 Sep 21 | |
| 262 | 50.51 | | | 49.72 | | Benjamin Davys | U20 | -5 | John Henson | Abingdon | Portsmouth | 23 May 21 | |
| 262 | 50.51 | | | 50.51 | PB | Nathan Langley | U23 | -2 | Mike Corden | Doncaster | Horspath | 3 Jul 21 | |
| 262 | 50.51 | | | 50.51 | PB | Charlie Holland | U20 | -6 | Wendy Slade | Swansea | Yate | 7 Aug 21 | |
| 265 | 50.53 | | | 50.01 | | Steven Perrie-Clyde | | 3 | Jared Deacon | Pitreavie | Stirling | 25 Jul 21 | |
| 266 | 50.54 | | | 50.33 | | Andrew Murphy | | 5 | Colin Sinclair | Kilbarchan | Sportcity | 28 Aug 21 | |
| 267 | 50.55 | | | 49.63 | | Owen Heard | U23 | -3 | Kate Dennison (now Rooney) | Harrow | Hendon | 31 Jul 21 | |
| 268 | 50.56 | | | 50.07 | | Jamie Lambert | U23 | -2 | Trevor Simcox | Bristol & West | Aberdare | 15 May 21 | |
| 269 | 50.57 | | | 47.21 | | Tommy Owler | U17 | -6 | Patricia Hanys | Folkestone | Sportcity | 10 Jul 21 | |
| 270 | 50.60 | | | 49.80i | | Tyson Oladokun | | 8 | Chris Zah | Southampton | Lee Valley | 25 Apr 21 | |
| 271 | 50.6 | | | 48.43 | | Joshua Ingham | | 4 | Stephen Ball | Preston | Blackburn | 19 Jun 21 | |
| 51.19 | | | | | | | | | | Leigh | 12 Jun 21 | |
| 272 | 50.61 | | | 49.55 | | Kristian Brown | | 1 | Greg Richards | Basildon | Stratford (CT) | 12 Sep 21 | |
| 273 | 50.63 | | | 50.40 | | Howard Bell | | 1 | Colin Sinclair | Woodford Green Essex Ladies | Sportcity | 28 Aug 21 | |
| 274 | 50.64 | | | 50.09 | | Kelechi Okorie | U23 | -1 | | Victoria Park & Tower Hamlets | Lee Valley | 20 Jun 21 | |
| 274 | 50.64 | | | 50.15 | | Dawood Chohan | U20 | -5 | | Harrow | Stevenage | 25 Jul 21 | |
| 274 | 50.64 | | | 50.32 | | William Lander | | 6 | | Holmfirth | York | 21 Aug 21 | |
| 274 | 50.64 | | | 50.19 | | Patrick Morgan | U20 | -5 | | Hereford | Bedford | 18 Sep 21 | |
| 278 | 50.65 | | | 50.65 | PB | Joshua Duke | U20 | -5 | Tom Druce | Guernsey | St. Peter Port | 27 Jun 21 | |
| 278 | 50.65 | | | 50.05 | | Daniel Hindle | U20 | -6 | | BRAT | Nuneaton | 31 Jul 21 | |
| 280 | 50.66 | | | 49.97 | | Mark Collier | | 7 | Max Coleby | Gateshead | Jarrow | 2 Jun 21 | |
| 281 | 50.69 | | | 50.00 | | Callum Newby | U20 | -4 | | Edinburgh AC | Bedford | 29 May 21 | |
| 282 | 50.70 | | | 49.53 | | Jonny Stock | U20 | -6 | Neil Canham | Trafford | Stretford | 27 Jun 21 | |
| 283 | 50.72 | | | 50.72 | PB | Matthew Linsley | | 4 | David Lowes | Gateshead | Gateshead | 29 Aug 21 | |
| 284 | 50.75 | | | 50.67 | | John Bridge T47 | U23 | -2 | Darrell Maynard | Cardiff | Bydgoszcz, POL | 3 Jun 21 | |
| 284 | 50.75 | | | 49.42 | | Adam Thompson | | 2 | Ivor Patrick Northey | Herne Hill | Kingston | 1 Aug 21 | |
| 286 | 50.76 | | | 50.76 | PB | Samad Tolulope Ibrahim | U20 | -4 | Winston Thomas | Dacorum | Bedford | 12 Jun 21 | |
| 286 | 50.76 | | | 49.82 | | Justin Cooper | | 4 | Janice Kaufman | Gateshead | Leigh | 12 Jun 21 | |
| 288 | 50.78 | | | 50.78 | PB | Thomas Elliott | U17 | -6 | Neal Edwards | City of Plymouth | Exeter | 18 Jul 21 | |
| 288 | 50.78 | | | 50.03 | | David Wilson | | 2 | William Parker | Victoria Park City of Glasgow | Grangemouth | 14 Aug 21 | |
| 290 | 50.79 | | | 49.73 | | Ethan Kirby T20/F20 | U23 | -3 | | Newton Abbot | Plymouth | 6 Jun 21 | |
| 290 | 50.79 | | | 49.79 | | Max Elliott | U20 | -5 | Sandra Woodman | Yate | Yate | 28 Aug 21 | |
| 292 | 50.8 | | | 50.74i | | Josh Allen | U23 | -2 | Martin Peevor | Middlesbrough (Mandale) | Middlesbrough | 6 Jun 21 | |
| 292 | 50.8 | | | 51.26/50.8 | PB | Jack Messenger | | 3 | Aidan Bailey | Basingstoke & Mid Hants | Basingstoke | 20 Jun 21 | |
| 51.88 | | | | | | | | | | Southampton | 16 May 21 | |
| 292 | 50.8 | | | 51.75/50.4 | | James Rachel | U20 | -5 | Paul Tasker | Tamworth | Stoke | 27 Jun 21 | |
| 292 | 50.8 | | | 50.86/50.8 | PB | Matthew French | U20 | -5 | | Manchester H | Leigh | 1 Aug 21 | |
| 50.86 | | | | | | | | | | Stretford | 9 May 21 | |
| 292 | 50.8 | | | 48.64 | | Harry Russell | | 3 | Martin Cook | Newbury | Basingstoke | 14 Aug 21 | |
| 292 | 50.8 | | | 49.38 | | Ethan Dray | U20 | -4 | | Walton | Walton | 5 Sep 21 | |
| 51.97 | | | | | | | | | | Carshalton | 27 Jun 21 | |
| 298 | 50.83 | | | 49.08 | | Joseph O'Hara | | 3 | Jon Armstrong | Bexley | Ashford | 8 May 21 | |
| 299 | 50.85 | | | 49.29 | | Ethan Curran | U17 | -7 | Vince Golding | Crawley | Stratford (CT) | 12 Sep 21 | |
| 300 | 50.87 | | | 50.87 | PB | William Brodie | U20 | -4 | Rupert Pepper | Poole Runners | Horspath | 11 Sep 21 | |
| 300 | 50.87 | | | 50.87 | PB | Thomas Walley | | 1 | Geoff Ward | Wrexham | Bangor (NI) | 12 Sep 21 | |
| 302 | 50.88 | | | 49.06 | | Joe Wheeler | U17 | -6 | | Tavistock | Sportcity | 10 Jul 21 | |
| 303 | 50.89 | | | 49.57 | | Max Perez-Diaz | | 2 | Richard Holt | Kingston & Poly | Chelmsford | 6 Jun 21 | |
| 303 | 50.89 | | | 50.89 | PB | Ben Pearson | U20 | -6 | Paul Daynes | City of York | York | 21 Aug 21 | |
| 303 | 50.89 | | | 50.89 | PB | Nathan Firla | U17 | -8 | Roy Dickens | Blackheath & Bromley | Kingston | 22 Aug 21 | |
| 306 | 50.90 | | | 47.29 | | Nicholas Kanonik | | 12 | Dale Garland | Yate | Nuneaton | 16 May 21 | |
| 306 | 50.90 | | | 50.90 | PB | Finlay Stewart | U20 | -6 | Joanne Savage | City of Lisburn | Belfast | 22 May 21 | |
| 306 | 50.90 | i | | 50.90i | PB | Euan Smith | U20 | -4 | | Central | Emirates Arena | 12 Dec 21 | |
| 309 | 50.9 | | | 50.10 | | Reece Stalker | U23 | -1 | | Seaton | Leigh | 19 Jun 21 | |
| 309 | 50.9 | | | 51.22/50.9 | PB | Christopher Perkins | U17 | -7 | Gary Curtis | Birtley | Whitley Bay | 1 Aug 21 | |
| 51.22 | | | | | | | | | | Jarrow | 2 Jun 21 | |
| 309 | 50.9 | | | 52.13/50.9 | PB | Darren Oregbomwanhia | U20 | -4 | Mark Lancaster | Cambridge H | Erith | 14 Aug 21 | |
| 52.13 | | | | | | | | | | Eltham | 20 Jun 21 | |
| 312 | 50.92 | | | 50.92 | PB | Drew Burridge | U20 | -4 | Roy Dickens | Blackheath & Bromley | Gillingham | 3 May 21 | |
| 312 | 50.92 | | | 48.87i | | Seumas MacKay | U23 | -3 | David Wagstaff | Shetland | Lerwick | 18 Jul 21 | |
| 314 | 50.98 | | | 49.59 | | Jacob Blanc | U17 | -6 | Tony Benton | Havering | Hornchurch | 20 Jun 21 | |
| 314 | 50.98 | | | 50.98 | PB | Joseph Smith | U23 | -2 | | Rothwell | Cleckheaton | 25 Jul 21 | |
| 316 | 50.99 | | | 49.80 | | Scott Ram | U23 | -1 | David Feeney | Amber Valley & Erewash | Nuneaton | 7 Aug 21 | |
| 316 | 50.99 | i | | 50.71 | | Ben Sutherland | U20 | -6 | | Falkirk | Emirates Arena | 12 Dec 21 | |
| 318 | 51.00 | | | 49.67 | | Amaha Lawrence | U20 | -4 | | Sale Harriers Manchester | Sportcity | 3 Jul 21 | |
| 318 | 51.00 | | | 51.00 | PB | Adam Islam-Medeaux | U17 | -6 | | Blackheath & Bromley | Gillingham | 25 Jul 21 | |
| 320 | 51.0 | | | 50.39 | | Euan Hood | U23 | -2 | Derek Easton | Lasswade | Stirling | 15 May 21 | |
| 51.20 | | | | | | | | | | Livingston | 3 Sep 21 | |
| 320 | 51.0 | | | 50.40/50.1 | | William Brown | U23 | -2 | Chris Dorey | Jersey | Aldershot | 20 Jun 21 | |
| 51.12 | | | | | | | | | | Lee Valley | 25 Apr 21 | |
| 320 | 51.0 | | | 50.00 | | Tyler Bilyard | U23 | -3 | Rob Andrews | City of Norwich | Norwich | 20 Jun 21 | |
| 320 | 51.0 | | | 51.0 | PB | Albert Bradshaw | U17 | -6 | Simon Frith | Macclesfield | Stretford | 4 Jul 21 | |
| 320 | 51.0 | | | 49.05 | | Rowan Pearson | U17 | -7 | David Leach | Lewes | Lewes | 11 Jul 21 | |
| 51.30 | | | | | | | | | | Sportcity | 8 Aug 21 | |
| 320 | 51.0 | | | 49.48 | | Nunu Njoroge | U17 | -6 | | Windsor Slough Eton & Hounslow | Aldershot | 14 Aug 21 | |
| 51.29 | | | | | | | | | | Eton | 25 Jul 21 | |
| 326 | 51.01 | | | 48.75 | | Adrian Richards | V35 | 13 | Gladys Bird | Woodford Green Essex Ladies | Stratford (CT) | 12 Sep 21 | |
| 327 | 51.03 | | | 47.05 | | Nicholas Atwell | V35 | 13 | Donovan Reid | Thames Valley | Eton | 28 Aug 21 | |
| 327 | 51.03 | | | 51.03 | PB | Noel James | U20 | -5 | TJ Ossai | BFT Track Academy | Dagenham | 30 Aug 21 | |
| 329 | 51.04 | | | 49.78 | | Sam Johnson | U23 | -2 | Martyn Jones | Stockport | Kettering | 31 May 21 | |
| 329 | 51.04 | | | 50.66 | | Daniel Harding-Forbes | U17 | -7 | Alan Watts | Bedford & County | Horspath | 11 Sep 21 | |
| 331 | 51.05 | | | 51.05 | PB | Ben Callard | U20 | -5 | Tammie Ryder | Tavistock | Yeovil | 26 Jun 21 | |
| 331 | 51.05 | | | 50.06 | | Sam Brown | U23 | -2 | | Edinburgh AC | Liverpool | 28 Aug 21 | |
| 331 | 51.05 | | | 49.11 | | Joel Houslin | U17 | -7 | Gary Telfer | Thames Valley | Lee Valley | 30 Aug 21 | |
| 334 | 51.06 | | | 51.06 | PB | Liam Higgins | U20 | -4 | Jonathan Tilt | Southampton | Bromley | 6 Jun 21 | |
| 334 | 51.06 | | | 50.54 | | Stephen Bates | U20 | -5 | Paul Hayden | Nuneaton | Nuneaton | 31 Jul 21 | |
| 336 | 51.07 | | | 50.40 | | Edward Lake | U23 | -3 | Tony Hadley | City of York | York | 21 Aug 21 | |
| 337 | 51.10 | | | 50.02 | | Jack Gilland | U20 | -4 | Stephen Carroll | Liverpool H | Leigh | 12 Jun 21 | |
| 337 | 51.10 | | | 51.10 | PB | Benjamin Okeiyi Vicencio | U20 | -4 | Paul McKeown | Crawley | Bournemouth | 28 Aug 21 | |
| 339 | 51.1 | | | 51.88/51.1 | PB | Mikhail Filippov | U17 | -8 | | St. Albans AC | Hemel Hempstead | 12 Jun 21 | |
| 51.88 | | | | | | | | | | Sportcity | 10 Jul 21 | |
| 339 | 51.1 | | | 51.63/51.1 | PB | Jonathan Hughes | | 5 | Glenys Morton | Leicester | Loughborough | 20 Jun 21 | |
| 51.77 | | | | | | | | | | Nuneaton | 13 Jun 21 | |
| 339 | 51.1 | | | 51.70/51.1 | PB | Ben Voyce | U23 | -2 | Andrew Priest | Kidderminster & Stourport | Stourport | 20 Jun 21 | |
| 52.42 | | | | | | | | | | Stourport | 31 Jul 21 | |
| 339 | 51.1 | | | 51.79/51.1 | PB | Oliver Thatcher | U20 | -4 | Andrew Fisher | Winchester | Lee Valley | 26 Jun 21 | |
| 339 | 51.1 | | | 52.63i/51.1 | PB | David Iliffe | U20 | -5 | | Royal Sutton Coldfield | Solihull | 11 Jul 21 | |
| 339 | 51.1 | | | 50.59i | | Isaac Parker | U23 | -3 | Trevor Williams | Horwich | Carlisle | 1 Aug 21 | |
| 339 | 51.1 | | | 47.72 | | Luke Edwards | | 9 | | | Leigh | 1 Aug 21 | |
| 339 | 51.1 | | | 51.66/51.1 | PB | Charlie Hobson | U20 | -5 | Norman Poole | Sale Harriers Manchester | Leigh | 5 Sep 21 | |
| 347 | 51.14 | | | 49.67 | | Daniel Woodburn | | 6 | Bob Bridges | Belgrave | Milton Keynes | 28 Aug 21 | |
| 348 | 51.17 | | | 48.62 | | Cole Sinnott | U20 | -5 | Antoinette Inniss-Haycox | Kettering | Kettering | 6 Jul 21 | |
| 348 | 51.17 | | | 49.60 | | Elliot Thompson | | 7 | Greg Richards | Enfield & Haringey | Sportcity | 28 Aug 21 | |
| 348 | 51.17 | | | 51.17 | PB | Louis Morrison | U20 | -5 | | Trafford | Bedford | 18 Sep 21 | |
| 351 | 51.18 | | | 50.45 | | Bradley Ellison | U23 | -2 | | Rotherham | Sheffield | 1 Aug 21 | |
| 351 | 51.18 | | | 50.12 | | Jack Lipman | U17 | -7 | Gareth Davies | Oxford City | Sportcity | 8 Aug 21 | |
| 353 | 51.2 | | | 51.72/51.2 | PB | Harvey Noble | U20 | -4 | Peter Hancock | Preston | Cheltenham | 29 May 21 | |
| 51.72 | | | | | | | | | | Leigh | 12 Jun 21 | |
| 353 | 51.2 | | | 51.27/51.2 | PB | William Brown | U17 | -7 | | Manchester H | Sportcity | 4 Jul 21 | |
| 51.27 | | | | | | | | | | Stretford | 12 Jun 21 | |
| 353 | 51.2 | | | 50.95 | | Rory Jarvis | | 3 | | PB | Par | 21 Aug 21 | |
| 51.36 | | | | | | | | | | Plymouth | 1 Aug 21 | |
| 356 | 51.21 | | | 49.54 | | David Brown | V40 | 21 | Tim Needham | Peterborough & Nene Valley | Hendon | 10 Jul 21 | |
| 357 | 51.22 | | | 51.22 | PB | Danny Raymond | U17 | -6 | John Stow | Woodford Green Essex Ladies | Hornchurch | 27 Jun 21 | |
| 357 | 51.22 | | | 49.93i | | Rhys Bennett | U17 | -7 | Linda Mcgreavy | Leamington | Sportcity | 8 Aug 21 | |
| 359 | 51.23 | | | 50.67/50.6 | | Nicholas McLeod | | 7 | Rick Betts | New Marske | Middlesbrough | 21 Aug 21 | |
| 360 | 51.24 | | | 51.00 | | Adetomiwa Oladiti | U23 | -3 | Vicente Modahl | Sale Harriers Manchester | Stretford | 22 Jun 21 | |
| 361 | 51.25 | | | 51.25 | PB | Freddie Arkell | U17 | -6 | Paul Miller | Hercules Wimbledon | Coulsdon | 1 May 21 | |
| 361 | 51.25 | | | 50.21 | | David Awde | V35 | 15 | Nick Phipps | Woking | Hendon | 31 Jul 21 | |
| 363 | 51.26 | | | 50.62 | | Conor O'Carroll | U20 | -5 | | Northern Ireland Schs | Belfast | 18 Jul 21 | |
| 363 | 51.26 | | | 48.92 | | James Mcintosh | U20 | -4 | Eddie McKenna | Aberdeen | Stirling | 25 Jul 21 | |
| 365 | 51.28 | | | 46.95 | | Harry Barton | U20 | -5 | Alan Richardson | Wells City | Bedford | 18 Sep 21 | |
| 366 | 51.29 | | | 50.10 | | Lewis Church | | 3 | David Hull | Tonbridge | Bedford | 29 May 21 | |
| 367 | 51.3 | | | 49.93/49.4 | | Liam Tracey | | 8 | | City of Stoke | Burton | 20 Jun 21 | |
| 367 | 51.3 | | | 47.18 | | John Kelley | V35 | 15 | | Sutton-in-Ashfield | Loughborough | 20 Jun 21 | |
| 367 | 51.3 | | | 50.65 | | Matthew Cox | U20 | -6 | Philip Olivier | Herts Phoenix | Ware | 20 Jun 21 | |
| 367 | 51.3 | | | 52.53/51.3 | PB | Aaron Duncan | U20 | -5 | David Leach | Lewes | Hastings | 14 Aug 21 | |
| 367 | 51.3 | | | 51.3 | PB | Abdelkarim Touati El Ouassaidi | | 4 | | Telford AC | Telford | 15 Aug 21 | |
| 367 | 51.3 | | | 51.12/49.8 | | Amardeep Sangha | | 9 | | Tipton | Telford | 15 Aug 21 | |
| 51.50 | | | | | | | | | | Loughborough | 8 Sep 21 | |
| 373 | 51.31 | | | 48.78 | | Tim Duckworth | | 3 | Toby Stevenson | Liverpool H | Chula Vista CA, USA | 24 Apr 21 | |
| 373 | 51.31 | | | 49.08 | | Liam Townson | U17 | -6 | Janice Kaufman | Gateshead | Gateshead | 29 Aug 21 | |
| 375 | 51.32 | | | 51.32 | PB | Euan O'Brien | U17 | -8 | | Giffnock North | Grangemouth | 15 Aug 21 | |
| 376 | 51.33 | | | 46.68/46.5 | | Dale Garland | V40 | 19 | | Guernsey | St. Peter Port | 2 May 21 | |
| 376 | 51.33 | | | 50.47 | | Eddie Griffin | U17 | -6 | | Taunton | Braunton | 30 May 21 | |
| 376 | 51.33 | | | 47.95 | | Henry Channon | U17 | -7 | | Oxford City | Eton | 27 Jun 21 | |
| 379 | 51.34 | | | 50.12 | | Chris Bain | U20 | -5 | Paul Ingrouille | Guernsey | St. Peter Port | 27 Jun 21 | |
| 380 | 51.36 | | | 51.10 | | Joshua Leatherd | U23 | -1 | David Norton | Preston | Aberdare | 15 May 21 | |
| 380 | 51.36 | | | 50.43 | | Fionn Leaney | U20 | -6 | Gareth Davies | Oxford City | Bedford | 18 Sep 21 | |
| 382 | 51.37 | | | 51.37 | PB | Benjamin Lineker | U17 | -7 | Amanda Edgley-Pearce | Medway & Maidstone | Kingston | 22 Aug 21 | |
| 383 | 51.38 | | | 51.38 | PB | Michael Cairns | U23 | -2 | | Glasgow City | Grangemouth | 18 Jul 21 | |
| 383 | 51.38 | | | 51.38 | PB | Sean Collins | U17 | -7 | Michael Doyle | Stockport | Hull | 15 Aug 21 | |
| 385 | 51.39 | | | 51.39 | PB | Danny Burrowes | | 2 | | Thames Valley | Nuneaton | 11 Apr 21 | |
| 386 | 51.40 | | | 50.65 | | Gareth Davies | | 3 | | Cardiff | Cardiff | 14 Aug 21 | |
| 386 | 51.40 | | | 49.85 | | Nathan Gavaghan | U20 | -5 | | Chesterfield | Nottingham | 12 Sep 21 | |
| 388 | 51.4 | | | 51.73/51.4 | PB | Joe Frew | U20 | -5 | Michael Dyer | Reading AC | Lee Valley | 26 Jun 21 | |
| 52.04 | | | | | | | | | | Bedford | 18 Sep 21 | |
| 388 | 51.4 | | | 51.54/51.4 | PB | James Petty | U20 | -5 | Stephen David Lott | Harlow AC | Chelmsford | 11 Jul 21 | |
| 51.99 | | | | | | | | | | Crawley | 8 May 21 | |
| 388 | 51.4 | | | 50.94 | | Joe Wells | | 7 | Brian MacKenzie | Chelmsford | Chelmsford | 11 Jul 21 | |
| 51.94 | | | | | | | | | | Chelmsford | 7 Aug 21 | |
| 388 | 51.4 | | | 50.45 | | Owen Hibbert | U23 | -2 | Neil Edwards | Deeside AAC | Macclesfield | 1 Aug 21 | |
| 388 | 51.4 | | | 49.25 | | Lamin Dampha | | 5 | | Birchfield H | Stourport | 8 Aug 21 | |
| 51.92 | | | | | | | | | | Kettering | 21 Aug 21 | |
| 393 | 51.43 | | | 51.43 | PB | Marley Bigg | U17 | -7 | Jon Bigg | Brighton Phoenix | Worthing | 1 Jun 21 | |
| 393 | 51.43 | | | 49.48 | | George Blake | U23 | -1 | Steven Munday | Medway & Maidstone | Gillingham | 14 Aug 21 | |
| 393 | 51.43 | | | 51.43 | PB | Brook Adnitt | | 2 | Neal Edwards | City of Plymouth | Par | 11 Sep 21 | |
| 396 | 51.44 | | | 50.69 | | Oliver Brooke | U17 | -8 | | Tonbridge | Gillingham | 25 Jul 21 | |
| 396 | 51.44 | | | 51.44 | PB | Kane McWatt | U20 | -6 | | Sale Harriers Manchester | Stretford | 21 Aug 21 | |
| 398 | 51.46 | | | 50.06 | | Lewis Cotterill | U23 | -3 | | Windsor Slough Eton & Hounslow | Greenfield SD, USA | 10 Apr 21 | |
| 399 | 51.49 | | | 51.25 | | Farris Vakil | U20 | -5 | Ian Gains | Ilford | Woodford | 14 Aug 21 | |
| 400 | 51.50 | | | 48.94 | | Joe Hubbock | U23 | -1 | Coral Nourrice | Newham & Essex Beagles | Lee Valley | 10 Apr 21 | |
| 400 | 51.50 | | | 47.52 | | Rick Beardsell | V40 | 20 | Stephen Ball | Trafford | Stretford | 25 May 21 | |
| 402 | 51.5 | | | 50.47 | | Adam Coates | U23 | -3 | Diana Norman | Epsom & Ewell | Oxford | 15 May 21 | |
| 51.73 | | | | | | | | | | Lee Valley | 4 Jul 21 | |
| 402 | 51.5 | | | 51.5 | PB | Ben Stevenson | U17 | -7 | | Derby | Doncaster | 22 May 21 | |
| 402 | 51.5 | | | 50.57/50.4 | | Sam Nelson | U23 | -3 | Kay Reynolds | Radley | Horspath | 12 Jun 21 | |
| 51.72 | | | | | | | | | | Birmingham (U) | 9 Jun 21 | |
| 402 | 51.5 | | | 51.36 | | Paolo Palmieri | U20 | -4 | | Ipswich | Norwich | 20 Jun 21 | |
| 52.21 | | | | | | | | | | Bedford | 12 Jun 21 | |
| 402 | 51.5 | | | 49.89 | | Will Steadman | U17 | -8 | Martin Branfoot | Chelmsford | Chelmsford | 15 Aug 21 | |
| 52.32 | | | | | | | | | | Chelmsford | 31 Jul 21 | |
| 407 | 51.53 | | | 51.07 | | Troy McConville | U20 | -4 | | Windsor Slough Eton & Hounslow | Arona, ESP | 12 Jun 21 | |
| 408 | 51.54 | | | 49.16 | | Robbie Shaw | | 4 | Trevor Madigan | Aberdeen | Grangemouth | 13 Jun 21 | |
| 409 | 51.55 | | | 51.55 | PB | Morgan White | U17 | -7 | | Sale Harriers Manchester | Stretford | 8 Jun 21 | |
| 410 | 51.57 | | | 49.80/49.7 | | Daniel Pearce | | 8 | Laurence Garnham | City of Plymouth | Plymouth | 1 Aug 21 | |
| 411 | 51.58 | | | 50.07 | | Harry Lord | | 1 | Matt Cullen | Sale Harriers Manchester | Durham NC, USA | 3 May 21 | |
| 411 | 51.58 | | | 51.58 | PB | Matt Hall | U17 | -6 | | Millfield Sch | Yeovil | 12 Jun 21 | |
| 413 | 51.59 | | | 50.79 | | James Palmer | | 10 | Geoffrey Barraclough | City of York | Leigh | 12 Jun 21 | |
| 414 | 51.60 | | | 50.63 | | William Palmer | U20 | -4 | David Wilkinson | Thames Valley | Jarrow | 2 Jun 21 | |
| 414 | 51.60 | | | 50.00 | | Jamal Chambers | | 1 | | Tipton | Kettering | 15 Jun 21 | |
| 414 | 51.60 | | | 50.63 | | Daniel Trueman | | 4 | Linford Christie | Stroud | Crawley | 31 Jul 21 | |
| 417 | 51.6 | | | 51.77/51.6 | PB | George Pugh | U23 | -1 | | Highgate | Cambridge | 17 Apr 21 | |
| 417 | 51.6 | | | 50.98i/50.7 | | Adrian Lloyd-Davies | U23 | -2 | Stuart Hamilton | Telford AC | Telford | 22 May 21 | |
| 417 | 51.6 | | | 50.75i | | Gino Brock | U20 | -6 | | Dundee Hawkhill | Dundee | 6 Jun 21 | |
| 52.41 | | | | | | | | | | Aberdeen | 29 Aug 21 | |
| 417 | 51.6 | | | 52.13/51.6 | PB | Max Whitaker | U20 | -6 | | Abingdon | Banbury | 8 Aug 21 | |
| 52.13 | | | | | | | | | | Abingdon | 12 Sep 21 | |
| 417 | 51.6 | | | 52.09/51.6 | PB | Ty Adkins | U20 | -5 | Catherine Mijovic | Bromsgrove & Redditch | Stourport | 8 Aug 21 | |
| 422 | 51.61 | | | 50.19 | | Alastair Walls | U17 | -6 | Scott Grace | Vale of Aylesbury | Kettering | 15 Jun 21 | |
| 423 | 51.67 | | | 47.56i | | Lawrence Baird | V40 | 22 | | Kingston upon Hull | Doncaster | 29 May 21 | |
| 424 | 51.69 | | | 50.59 | | Patrick Taylor | | 3 | Luke Gunn | Birchfield H | Hendon | 21 Aug 21 | |
| 425 | 51.70 | | | 51.70 | PB | Ben Reynolds | U20 | -4 | Arwyn Davies | Cardiff | Newport | 26 Jun 21 | |
| 425 | 51.70 | | | 51.70 | PB | Robert Anderson | U23 | -3 | | Cambridge & Coleridge | Lee Valley | 4 Jul 21 | |
| 427 | 51.7 | | | 48.36/48.3 | | Danny Higham | | 9 | Raymond Twentyman | Liverpool Pembroke Sefton | Sportcity | 4 Jul 21 | |
| 427 | 51.7 | | | 51.3 | | Osasu Fernandez Agho-Peter | U20 | -6 | | Burnley | Carlisle | 1 Aug 21 | |
| 427 | 51.7 | | | 52.58/51.7 | PB | Josh Fiddaman | U20 | -4 | Steven Walker | Blyth | Morpeth | 1 Aug 21 | |
| 427 | 51.7 | | | 51.7 | PB | Finlay Starkie | U17 | -6 | | Copeland | Whitehaven | 28 Aug 21 | |
| 427 | 51.7 | | | 52.40/51.7 | PB | Eniayo Odofin | U20 | -5 | | City of Portsmouth | Portsmouth | 30 Aug 21 | |
| 52.40 | | | | | | | | | | Portsmouth | 6 Jun 21 | |
| 432 | 51.72 | | | 48.48 | | Kevin Hodgson | | 3 | Stephen Ball | Bournemouth | Stretford | 3 Apr 21 | |
| 433 | 51.73 | | | 51.73 | PB | Jonathan Bull | | 2 | Max Coleby | Durham | Jarrow | 2 Jun 21 | |
| 434 | 51.74 | | | 51.74 | PB | Tom Butcher | U23 | -1 | | Birmingham Uni | Birmingham (U) | 12 May 21 | |
| 434 | 51.74 | | | 49.68 | | Ciaran Yeo | U20 | -4 | Martin Owens | Newton Abbot | Exeter | 18 Jul 21 | |
| 436 | 51.75 | | | 51.56/51.4 | | Alexander Newell | U20 | -6 | Sam Thorpe | Rotherham | Sheffield | 9 Jun 21 | |
| 436 | 51.75 | | | 51.75 | PB | Adam Nolan | U17 | -7 | Jeremy Dale | Yate | Yate | 27 Jun 21 | |
| 438 | 51.77 | | | 51.77 | PB | Samuel Mcshane | U17 | -6 | Jay Galley | Blackheath & Bromley | Bromley | 13 Aug 21 | |
| 438 | 51.77 | | | 51.48 | | Andrew McGill | U20 | -6 | Michael Johnston | Livingston | Livingston | 5 Sep 21 | |
| 440 | 51.79 | | | 51.79 | PB | Neon Richards | U20 | -5 | | Thames Valley | Lee Valley | 10 Apr 21 | |
| 440 | 51.79 | | | 51.79 | PB | Andrew Baldwin | | 1 | Trevor Madigan | Aberdeen | Grangemouth | 14 Aug 21 | |
| 442 | 51.80 | | | 48.20 | | Lewis Robson | | 11 | Derek Wilcox | Gateshead | Jarrow | 2 Jun 21 | |
| 442 | 51.80 | | | 50.00 | | Will Lord | | 2 | Pat Cornell | Ealing Southall & Middx | Harrow | 20 Jun 21 | |
| 442 | 51.80 | | | 49.71 | | George Whincup | U17 | -7 | | Vale of Aylesbury | Bracknell | 5 Sep 21 | |
| 442 | 51.80 | | | 50.64 | | Michael Shaw | U20 | -5 | Daniel Brooker | Brighton & Hove | Crawley | 5 Sep 21 | |
| 446 | 51.8 | | | 51.8 | PB | William Thornley | U20 | -4 | | Bromsgrove & Redditch | Gloucester | 16 May 21 | |
| 446 | 51.8 | | | 52.11/50.6 | | Jonny Price | U20 | -5 | | Shrewsbury | Telford | 19 Jun 21 | |
| 446 | 51.8 | | | 49.29 | | Ryan Elston | U20 | -5 | Alison Wyeth | Charnwood | Loughborough | 27 Jun 21 | |
| 446 | 51.8 | | | 53.18/51.8 | PB | Remi Adebiyi | U23 | -2 | Darryn McAtee | Newport H | Newport | 11 Jul 21 | |
| 446 | 51.8 | | | 51.8 | PB | Lewis Nagington | U20 | -4 | Martin Bailey | Newcastle (Staffs) AC | Stoke | 11 Jul 21 | |
| 446 | 51.8 | | | 50.34/50.3 | | Ollie Withers | U17 | -7 | Mike Chambers | Winchester | Winchester | 14 Aug 21 | |
| 446 | 51.8 | | | 46.94 | | Sam Lunt | U17 | -7 | Andrew Fraser | Wirral | Liverpool | 5 Sep 21 | |
| 52.03 | | | | | | | | | | Liverpool | 21 Aug 21 | |
| 446 | 51.8 | | | 51.73 | | Samuel Crick | U23 | -1 | Mark Hookway | Tonbridge | Ashford | 11 Sep 21 | |
| 454 | 51.81 | | | 49.97 | | Harry North | U23 | -2 | | Reading AC | Battersea Park | 23 May 21 | |
| 454 | 51.81 | | | 51.33 | | Jordan Cunningham | U20 | -4 | | City of Lisburn | Belfast | 7 Aug 21 | |
| 456 | 51.82 | | | 49.99 | | James Heneghan | U23 | -1 | James Thie | Cardiff | Yate | 7 Aug 21 | |
| 457 | 51.83 | | | 51.31 | | George Warren | U20 | -4 | Frank Adams | London Heathside | Woodford | 27 Jul 21 | |
| 457 | 51.83 | | | 50.30 | | George Muana | | 2 | | S Factor | Dagenham | 30 Aug 21 | |
| 457 | 51.83 | | | 51.83 | PB | Jack Westerman | U17 | -7 | | Guildford & Godalming | Eton | 11 Sep 21 | |
| 460 | 51.84 | | | 50.01 | | Neil Holloway | | 5 | Peter Barry | Harrow | Harrow | 20 Jun 21 | |
| 460 | 51.84 | | | 51.71 | | Lewis MacIver | U20 | -5 | | Livingston | Grangemouth | 18 Jul 21 | |
| 462 | 51.85 | | | 51.85 | PB | Daniel Goriola | U17 | -7 | John Gates | Bexley | Hornchurch | 27 Jun 21 | |
| 463 | 51.86 | | | 49.09 | | Caleb Mcleod | U17 | -8 | Steven Doig | Pitreavie | Dunfermline | 21 Aug 21 | |
| 463 | 51.86 | | | 51.11i | | Mateo Hughes | U17 | -7 | John Scott | Edinburgh AC | Livingston | 3 Sep 21 | |
| 465 | 51.87 | | | 49.96 | | Rhys Granville | | 3 | Darrell Maynard | Swansea | Nuneaton | 1 May 21 | |
| 465 | 51.87 | | | 50.66 | | Liam Reveley | | 1 | Liane Brown | Jarrow & Hebburn | Bedford | 29 May 21 | |
| 467 | 51.89 | | | 50.80 | | Will Lovejoy | U20 | -5 | | Newport H | Newport | 1 May 21 | |
| 467 | 51.89 | | | 51.89 | PB | Prince Reid T20/F20 | U23 | -3 | | Blackheath & Bromley | Gateshead | 13 Jul 21 | |
| 467 | 51.89 | | | 50.13 | | Harrison Wheeler | U17 | -6 | Chris Franklin | Llanelli | Derby | 25 Sep 21 | |
| 470 | 51.90 | | | 51.23 | | Daniel Hamilton-Strong | U20 | -5 | Richard Derrick | Exeter | Exeter | 16 May 21 | |
| 471 | 51.9 | | | 51.18 | | Elliot Doughty | U23 | -3 | Howard Moscrop | Swindon | Basingstoke | 20 Jun 21 | |
| 471 | 51.9 | | | 49.91 | | Kane Smart | U17 | -7 | Philip Jones | Colwyn Bay | Ellesmere Port | 27 Jun 21 | |
| 52.00 | | | | | | | | | | Derby | 25 Sep 21 | |
| 471 | 51.9 | | | 50.67 | | Luke Dronfield | U17 | -7 | Marina Armstrong | Guildford & Godalming | Guildford | 27 Jun 21 | |
| 471 | 51.9 | | | 51.2 | | Adam Peacock | | 7 | Steve James | BRAT | Cheltenham | 28 Jul 21 | |
| 471 | 51.9 | | | 52.09/51.9 | PB | Luke Powell | U17 | -8 | | Colchester & Tendring | Colchester | 19 Sep 21 | |
| 52.73 | | | | | | | | | | Chelmsford | 31 Jul 21 | |
| 476 | 51.97 | | | 51.97/51.8 | PB | Oliver Edwards | | 1 | Ian Broadhurst | Wrexham | Cardiff | 14 Aug 21 | |
| 477 | 51.98 | | | 51.98 | PB | Ronnie Adoma | U17 | -7 | | Essex Schs | Chelmsford | 12 Jun 21 | |
| 478 | 51.99 | | | 51.07i | | Alexander Evelegh | | 5 | Carlo Monticolombi | Shaftesbury Barnet | Watford | 25 Aug 21 | |
| 479 | 52.00 | | | 50.54 | | Alex Ruggles | | 4 | | Southampton | Portsmouth | 23 May 21 | |
| 479 | 52.00 | | | 52.00/51.6 | PB | Sebastian Mills | U23 | -2 | | Chiltern | Horspath | 14 Aug 21 | |
| 479 | 52.00 | | | 51.46 | | Lloyd Ellis | U23 | -1 | Mike Bennett | Birmingham Uni | Leamington | 26 Aug 21 | |
| 482 | 52.0 | | | 51.64 | | Jamie Webster | U20 | -4 | Simon Goodwin | Bedford & County | Peterborough | 6 Jun 21 | |
| 52.35 | | | | | | | | | | Harrow | 13 May 21 | |
| 482 | 52.0 | | | 49.80i | | Joel Burgess | U17 | -7 | Ian Burgess | City of Norwich | Norwich | 20 Jun 21 | |
| 482 | 52.0 | | | 51.0 | | Charlie Roberts | U20 | -5 | | St. Helens Sutton | Sportcity | 4 Jul 21 | |
| 482 | 52.0 | | | 51.68i | | Gareth Holden | | 6 | Bob Bridges | Belgrave | Battersea Park | 11 Jul 21 | |
| 482 | 52.0 | | | 50.25 | | Liam Holbrook | | 1 | Roger Williams | Hillingdon | Hillingdon | 11 Jul 21 | |
| 482 | 52.0 | | | 52.0 | PB | Tom Willshaw | U20 | -5 | | Macclesfield | Macclesfield | 1 Aug 21 | |
| 482 | 52.0 | | | 52.33/52.0 | PB | Dan Peters | U17 | -7 | Eileen Naylor | Havering | Basildon | 12 Sep 21 | |
| 52.33 | | | | | | | | | | Hornchurch | 19 Sep 21 | |
| 489 | 52.01 | | | 51.40/51.1 | | Ethan Ellis | U17 | -7 | Denis Costello | City of Norwich | Sportcity | 28 Aug 21 | |
| 490 | 52.03 | | | 50.25i/50.1 | | Matthew Hughes | U20 | -6 | Raymond Twentyman | Liverpool Pembroke Sefton | Leigh | 12 Jun 21 | |
| 490 | 52.03 | | | 52.03 | PB | Harry Cox | U23 | -2 | Steve Perkin | Chiltern | Lee Valley | 4 Jul 21 | |
| 490 | 52.03 | | | 49.84 | | Stephen Simmons | U20 | -5 | Dennis Johnson | Bedford & County | Bedford | 18 Sep 21 | |
| 493 | 52.04 | | | 51.48 | | Keith Hutchinson | V40 | 19 | Ken Harker | Hartlepool | Jarrow | 21 Jul 21 | |
| 493 | 52.04 | | | 49.26 | | Dan Bray | V35 | 16 | | Havant | Lee Valley | 1 Aug 21 | |
| 495 | 52.06 | | | 52.06 | PB | Ben Nelson | | 5 | Aaron Odentz | Aberdeen | Aberdeen | 4 Jul 21 | |
| 496 | 52.07 | | | 51.27 | | Miles Sizer | U23 | -3 | Richard Gayle | Wakefield | Rotherham | 22 May 21 | |
| 496 | 52.07 | | | 51.71i | | Cameron Smith | U23 | -3 | | Team East Lothian | Grangemouth | 14 Aug 21 | |
| 496 | 52.07 | | | 51.27i | | Andrew Baird | U20 | -4 | Donald Mcintosh | Kilmarnock | Aberdeen | 29 Aug 21 | |
| 499 | 52.08 | | | 52.08 | PB | Benjamin Murray | U23 | -2 | | Atletismo Mijas | Málaga (C), ESP | 29 May 21 | |
| 499 | 52.08 | | | 50.37 | | Gian-Luca Robilliard | U17 | -6 | Alun Williams | Guernsey | St. Peter Port | 27 Jun 21 | |
| 499 | 52.08 | | | 52.08 | PB | Leon Lafreniere | U17 | -6 | | Woking | Kingston | 1 Aug 21 | |
| 502 | 52.09 | | | 50.38 | | Matthew Douthwaite | U23 | -3 | Carol Williams | Durham | Middlesbrough | 21 Aug 21 | |
| 503 | 52.10 | | | 49.75 | | Andrew Ajube | | 7 | Marina Armstrong | Thames Valley | Bromley | 6 Jun 21 | |
| 503 | 52.10 | | | 50.68i | | Tom Chandler | | 2 | Rafer Joseph | Basingstoke & Mid Hants | Carshalton | 11 Sep 21 | |
| 505 | 52.1 | | | 54.74/52.1 | PB | Alec Batila-Mountsompa | U20 | -4 | Derek Yeomans | City of Stoke | Stoke | 27 Jun 21 | |
| 505 | 52.1 | | | 48.71 | | Nathan Kabel | U17 | -6 | Damian Nevins | Harrow | Hillingdon | 11 Jul 21 | |
| 52.71 | | | | | | | | | | Harrow | 20 Jun 21 | |
| 505 | 52.1 | | | 51.96 | | Ben Smith | U20 | -5 | Richard Massey | Mansfield | Newark | 25 Jul 21 | |
| 505 | 52.1 | | | 51.06i | | Coleman Corry | U23 | -3 | John Blackie | Blackheath & Bromley | Exeter | 20 Oct 21 | |
| 509 | 52.11 | | | 51.57 | | Sam Winters | | 7 | Simon Goodwin | Marshall Milton Keynes | Milton Keynes | 3 Jul 21 | |
| 509 | 52.11 | | | 52.11 | PB | Natan Witkowski | U17 | -6 | Ian Halliday | Bury | Sportcity | 28 Aug 21 | |
| 509 | 52.11 | | | 50.29 | | Calum Bressington | | 7 | | Southampton | Southampton | 11 Sep 21 | |
| 512 | 52.13 | | | 51.40 | | Evan Campbell | U23 | -3 | Jade Surman | Shaftesbury Barnet | Birmingham (U) | 12 May 21 | |
| 512 | 52.13 | | | 48.16 | | Ben Heron | U17 | -7 | | North Ayrshire | Grangemouth | 15 Aug 21 | |
| 514 | 52.14 | | | 52.08 | | Jack Houghton | U23 | -2 | Andrew Griffiths | Swansea | Aberdare | 15 May 21 | |
| 514 | 52.14 | | | 52.14 | PB | Sam Amdor | U17 | -7 | John Wildman | Highgate | Bromley | 13 Aug 21 | |
| 514 | 52.14 | | | 51.86 | | Luka Sidebotham | U17 | -7 | Stephen Carroll | Liverpool H | Hull | 15 Aug 21 | |
| 517 | 52.16 | | | 52.16 | PB | Alexander Thompson | U20 | -5 | Karen Glerum | Wharfedale | Gateshead | 27 Jun 21 | |
| 518 | 52.17 | | | 51.90 | | Douglas Noel | U23 | -3 | Jacob Burton | Invicta East Kent | Bedford | 29 May 21 | |
| 519 | 52.18 | | | 52.18 | PB | Zac Beasty | U20 | -6 | Andy Poppleton | Tonbridge | Eltham | 27 Jun 21 | |
| 519 | 52.18 | | | 52.18 | PB | Jacob Harrison | U20 | -6 | Guy Holden | South London | Plymouth | 14 Aug 21 | |
| 521 | 52.19 | | | 51.42 | | Oliver Weston | U20 | -4 | James Roberts | Invicta East Kent | Gillingham | 7 Aug 21 | |
| 522 | 52.20 | | | 52.06 | | Josh Strudwick | | 5 | Rafer Joseph | Basingstoke & Mid Hants | Bournemouth | 28 Aug 21 | |
| 523 | 52.2 | | | 51.14 | | Jamie Rashbrook | U20 | -5 | Martin Brown | Basildon | Chelmsford | 11 Jul 21 | |
| 52.80 | | | | | | | | | | Basildon | 5 Sep 21 | |
| 523 | 52.2 | | | 52.2 | PB | William Strickley | U17 | -6 | Sarah Kearney | Wirral | Bebington | 25 Jul 21 | |
| 523 | 52.2 | | | 52.55/51.8 | | Alastar Phelan | U23 | -1 | Richard Phelan | Peterborough & Nene Valley | Peterborough | 14 Aug 21 | |
| 523 | 52.2 | | | 52.05/51.9 | | Oscar North | U17 | -7 | Deborah Keenleyside | Dacorum | Watford | 12 Sep 21 | |
| 527 | 52.23 | | | 50.81i/50.4 | | Jack Dickinson | | 2 | Les Hall | Bolton | Stretford | 22 May 21 | |
| 527 | 52.23 | | | 50.15 | | Jordan Chambers | | 2 | | Tonbridge | Crawley | 31 Jul 21 | |
| 529 | 52.24 | | | 51.62 | | Luca Matharu | U17 | -6 | Damian Nevins | Harrow | Harrow | 30 May 21 | |
| 529 | 52.24 | | | 50.39 | | Max Brazier | U23 | -3 | Daniel Brooker | Brighton & Hove | Worthing | 1 Jun 21 | |
| 529 | 52.24 | | | 52.24 | PB | Samuel Marney | U17 | -6 | | Bracknell AC | Eton | 1 Aug 21 | |
| 529 | 52.24 | | | 47.30 | | Alexander Beck | U17 | -8 | | Winchester | Kingston | 22 Aug 21 | |
| 533 | 52.26 | | | 52.26 | PB | Finley Smith | U17 | -6 | | Middlesex Schs | Harrow | 20 Jun 21 | |
| 534 | 52.29 | | | 50.68 | | George Rees | U20 | -4 | Vanessa Hammett | Kingston & Poly | Kingston | 3 Jul 21 | |
| 535 | 52.30 | | | 52.30 | PB | Jamie Russell | U20 | -5 | Paul Deakin | Solihull & Small Heath | Coventry | 25 Jul 21 | |
| 535 | 52.30 | | | 52.30 | PB | James Milburn | U23 | -1 | Richard Eastman | Kidderminster & Stourport | Gateshead | 29 Aug 21 | |
| 537 | 52.3 | | | 50.60 | | Matthew Ward | | 2 | | Derby | Doncaster | 22 May 21 | |
| 537 | 52.3 | | | 52.3 | PB | Jonathan Timmins | | 8 | | Tipton | Telford | 20 Jun 21 | |
| 537 | 52.3 | | | 54.35/52.2 | | Peter Dear | | 1 | | Halesowen | Telford | 20 Jun 21 | |
| 537 | 52.3 | | | 52.55/51.9 | | James Nicholas | U20 | -4 | | Blackpool, Wyre & Fylde | Blackpool | 27 Jun 21 | |
| 537 | 52.3 | | | 53.46/52.3 | PB | Cameron Clowes | U17 | -7 | | Hertford & Ware | Cambridge | 25 Jul 21 | |
| 537 | 52.3 | | | 53.07/52.3 | PB | Jeremy Gundle | U17 | -7 | | Rugby & Northampton | Corby | 1 Aug 21 | |
| 537 | 52.3 | | | 53.28/52.3 | PB | Michael Brent-Reid | | 3 | | Blackpool, Wyre & Fylde | Blackpool | 21 Aug 21 | |
| 544 | 52.31 | | | 50.46i | | Adam Reid | U23 | -3 | | Chelmsford | Chelmsford | 31 Jul 21 | |
| 544 | 52.31 | | | 49.31/48.9 | | Andrew Faulkner | V35 | 13 | | Yeovil | Derby | 22 Aug 21 | |
| 546 | 52.32 | | | 50.20 | | Reuben Cole | | 2 | Derek Wilcox | Gateshead | Leigh | 12 Jun 21 | |
| 546 | 52.32 | | | 51.35 | | Rowan Board | | 2 | Pat Cornell | Ealing Southall & Middx | Perivale | 15 Aug 21 | |
| 548 | 52.34 | | | 52.34 | PB | Daniel Thomas | U23 | -3 | Rafer Joseph | Basingstoke & Mid Hants | Horspath | 3 Jul 21 | |
| 549 | 52.38 | | | 52.38 | PB | Joe Morris | | 6 | Julia Machin | Brighton & Hove | Tonbridge | 6 Jun 21 | |
| 549 | 52.38 | | | 51.38 | | Christopher Boyle | | 2 | | Victoria Park City of Glasgow | Grangemouth | 13 Jun 21 | |
| 551 | 52.40 | | | 52.07i | | Louis How | U17 | -8 | Paul Daynes | City of York | York | 22 Aug 21 | |
| 551 | 52.40 | | | 52.40 | PB | Oliver D'Rozario | U20 | -5 | Steve Shaw | Taunton | Bedford | 18 Sep 21 | |
| 553 | 52.4 | | | 50.25 | | Ben Sandilands | U20 | -5 | Steven Doig | Fife | Dunfermline | 9 May 21 | |
| 553 | 52.4 | | | 51.37 | | James McCrae | | 2 | James Thie | Hallamshire | Peterborough | 16 May 21 | |
| 553 | 52.4 | | | 52.85i/52.4 | PB | Charlie Wakefield | U20 | -4 | Mick Graham | St. Edmund Pacers | Norwich | 20 Jun 21 | |
| 553 | 52.4 | | | 49.49/49.4 | | Cameron Bain | | 2 | Kyle Bennett | Oxford Uni | Cheltenham | 28 Jul 21 | |
| 553 | 52.4 | | | 52.37 | | Oliver Cloherty | U20 | -6 | | Windsor Slough Eton & Hounslow | Aldershot | 14 Aug 21 | |
| 553 | 52.4 | | | 53.19/52.4 | PB | Callum Hanlon | | 5 | | Leamington | Rugby | 15 Aug 21 | |
| 553 | 52.4 | | | 52.4 | PB | Charlie Bird | U20 | -4 | | Jersey | St. Clement | 19 Aug 21 | |
| 553 | 52.4 | | | 50.16 | | Maurizio Corrodus | U20 | -6 | Roy Dickens | Blackheath & Bromley | Dartford | 5 Sep 21 | |
| 561 | 52.41 | | | 48.08 | | Jonathan Elderfield | V35 | 13 | | Basingstoke & Mid Hants | Basingstoke | 3 Jul 21 | |
| 561 | 52.41 | | | 49.52 | | William Hodi | U20 | -5 | | Nairn | Kilmarnock | 10 Jul 21 | |
| 561 | 52.41 | | | 52.41 | PB | Jake Osorio | U20 | -6 | | Herne Hill | Hendon | 21 Aug 21 | |
| 564 | 52.42 | | | 52.42 | PB | Bradley James | U20 | -5 | Sam Harrison | Havering | Bedford | 18 Sep 21 | |
| 565 | 52.45 | | | 51.80 | | Andrew Parker | V40 | 21 | Stephen Ball | West Cheshire | Derby | 22 Aug 21 | |
| 565 | 52.45 | | | 49.31 | | Joseph Lane | U23 | -2 | John Henson | Chelmsford | Watford | 25 Aug 21 | |
| 567 | 52.46 | | | 52.11i | | Christopher Perry | U23 | -2 | Steve Green | Exeter | Sportcity | 29 May 21 | |
| 568 | 52.47 | | | 49.35 | | Harry McPhee | U17 | -8 | David Lothian | Falkirk | Grangemouth | 15 Aug 21 | |
| 569 | 52.48 | | | 51.16 | | Ben Brooker | U17 | -7 | Shane Smith | Kettering | Kettering | 6 Jul 21 | |
| 570 | 52.49 | | | 50.33 | | Louis Goodwin | U17 | -7 | David Leach | Lewes | Crawley | 31 Jul 21 | |
| 571 | 52.50 | | | 52.28 | | Matthew Brunnock | U17 | -7 | | Hereford | Yate | 27 Jun 21 | |
| 571 | 52.50 | | | 51.13 | | Alexander Cresswell | U20 | -4 | | City of Portsmouth | Portsmouth | 11 Jul 21 | |
| 571 | 52.50 | | | 50.39 | | Dereece Green | | 4 | | Windsor Slough Eton & Hounslow | Hendon | 21 Aug 21 | |
| 574 | 52.5 | | | 50.24 | | Memphis Ayoade | U20 | -4 | Anthony Mayhew | Herne Hill | Battersea Park | 20 Jun 21 | |
| 574 | 52.5 | | | 53.02/52.5 | PB | Ethan Cowdrey | U17 | -6 | | Crawley | Lewes | 27 Jun 21 | |
| 574 | 52.5 | | | 51.06/50.9 | | Tom Barnett | U17 | -8 | | City of Stoke | Stoke | 27 Jun 21 | |
| 574 | 52.5 | | | 52.61/52.3 | | Henry Heathcote | U17 | -7 | | Cannock & Stafford | Stoke | 27 Jun 21 | |
| 574 | 52.5 | | | 50.68 | | Zak Old | U17 | -6 | Lee Cleary-Morgan | North Shields Poly | Morpeth | 1 Aug 21 | |
| 574 | 52.5 | | | 49.49 | | Edward Enser | U17 | -7 | Jamie Ashton | Bracknell AC | Aldershot | 14 Aug 21 | |
| 574 | 52.5 | | | 52.5 | PB | Adam Swift | U20 | -4 | | Leigh | Leigh | 5 Sep 21 | |
| 581 | 52.51 | | | 52.51 | PB | Nicholas Blore | U23 | -3 | | Macclesfield | Stretford | 24 Apr 21 | |
| 581 | 52.51 | | | 51.53 | | Aston Lockwood | U23 | -1 | Trevor Simcox | Lewes | Dagenham | 26 Jun 21 | |
| 581 | 52.51 | i | | 50.66i | | Ross Veitch | U20 | -5 | Anne Stewart | Giffnock North | Emirates Arena | 12 Dec 21 | |
| 584 | 52.52 | | | 51.57 | | Patrick Griffith | U17 | -7 | Andrew Carter | Vale Royal | Stretford | 8 Jun 21 | |
| 584 | 52.52 | | | 51.22/50.7 | | Ben Healey | | 3 | Alex Budd | Winchester | Milton Keynes | 3 Jul 21 | |
| 586 | 52.53 | | | 51.96/51.9 | | Ewan Maxwell | U17 | -6 | Harry Czapski | Vale of Aylesbury | Watford | 25 Aug 21 | |
| 586 | 52.53 | | | 52.53 | PB | Jonathan Cameron | U17 | -7 | Emma Forster | Inverclyde | Stretford | 25 Sep 21 | |
| 588 | 52.54 | | | 51.41i/51.4 | | Christian Chapajong | U17 | -6 | Neville Facey | Birchfield H | Coventry | 25 Jul 21 | |
| 589 | 52.55 | | | 49.09 | | Scott Hannaway | U20 | -4 | Dave Combe | Greenock Glenpark | Kilmarnock | 8 May 21 | |
| 589 | 52.55 | | | 50.72 | | Joel Akande | U23 | -2 | | | Loughborough | 12 May 21 | |
| 589 | 52.55 | | | 52.55 | PB | Oscar Cousins | U20 | -5 | | Chesterfield | Sheffield | 18 Jul 21 | |
| 592 | 52.56 | | | 52.56 | PB | Charlie Mansfield | U20 | -5 | Duncan Mason | Salford H | Stretford | 8 Jun 21 | |
| 592 | 52.56 | | | 52.56 | PB | Alex Knight | U17 | -8 | | Team Bath | Sportcity | 10 Jul 21 | |
| 592 | 52.56 | | | 51.40 | | Finn Punton | U17 | -6 | Andrew Kennard | Walton | Kingston | 1 Aug 21 | |
| 595 | 52.58 | | | 52.58 | PB | Adam Jones | U23 | -3 | Mark Bleasdale | Liverpool Pembroke Sefton | Stretford | 10 Apr 21 | |
| 595 | 52.58 | | | 52.58 | PB | Jack Saxby | U17 | -7 | | Ashford AC | Eltham | 27 Jun 21 | |
| 597 | 52.60 | | | 50.11 | | Adam Bellis | V40 | 23 | | Trafford | Sheffield | 12 Sep 21 | |
| 598 | 52.6 | | | 53.25/52.6 | PB | William Scates | U17 | -8 | | City of Norwich | Peterborough | 16 May 21 | |
| 598 | 52.6 | | | 52.97/52.6 | PB | James Jones | U20 | -4 | Neil Edwards | Deeside AAC | Salford | 22 May 21 | |
| 52.97 | | | | | | | | | | Newport | 31 Jul 21 | |
| 598 | 52.6 | | | 50.82 | | Joe Strange | | 6 | Simon Goodwin | Bedford & County | Peterborough | 6 Jun 21 | |
| 598 | 52.6 | | | 48.45 | | Shem Nelson | | 13 | Joe Caines | Royal Sutton Coldfield | Birmingham (U) | 20 Jun 21 | |
| 598 | 52.6 | | | 50.10 | | William Bowker | U20 | -5 | | Ipswich | Norwich | 20 Jun 21 | |
| 598 | 52.6 | | | 52.6 | PB | Jamie Teare | U20 | -4 | | Blackburn | Blackpool | 27 Jun 21 | |
| 598 | 52.6 | | | 51.05 | | Adam Firsht | U20 | -5 | John Clements | Brighton & Hove | Lewes | 27 Jun 21 | |
| 598 | 52.6 | | | 53.63/52.6 | PB | Connor Roberts | U17 | -7 | | Northampton | Peterborough | 14 Aug 21 | |
| 598 | 52.6 | | | 52.86/52.5 | | Graham Boreham | | 4 | | Southport Waterloo | Blackpool | 21 Aug 21 | |
| 598 | 52.6 | | | 51.47 | | Fraser Kilsby | U23 | -3 | | Wycombe | Bracknell | 11 Sep 21 | |
| 608 | 52.61 | | | 50.62 | | Jacob Kinchin-Smith | U20 | -6 | | Stevenage & North Herts | Harrow | 30 May 21 | |
| 608 | 52.61 | | | 52.48 | | Lewis Black | U23 | -1 | John Baron | Vale of Aylesbury | Abingdon | 20 Jun 21 | |
| 610 | 52.63 | | | 52.38 | | Thomas Marwood | U23 | -3 | Martin Cook | Sheffield Uni | Sheffield | 9 Jun 21 | |
| 610 | 52.63 | | | 50.44 | | Matthew Mustard | U23 | -3 | Martin Cook | Sheffield Uni | Loughborough | 28 Aug 21 | |
| 612 | 52.64 | | | 50.21 | | Makun Madar | | 2 | Julie Coleby | Notts | Stretford | 6 Jun 21 | |
| 613 | 52.65 | i | | 52.65i | PB | Jamie Killoh | U23 | -2 | | Stirling Uni | Emirates Arena | 20 Oct 21 | |
| 614 | 52.67 | | | 51.38/51.3 | | Tom Pallot | | 1 | | Yate | Yate | 3 Jul 21 | |
| 614 | 52.67 | | | 52.67 | PB | Elliot Holman | | 2 | Paul MacGregor | Guildford & Godalming | Eton | 11 Sep 21 | |
| 614 | 52.67 | | | 52.67 | PB | Ayomide Babatunde | U17 | -6 | Darren Priestley | Havering | Bedford | 18 Sep 21 | |
| 617 | 52.68 | | | 52.09 | | Rowan Gomanee | U17 | -7 | Katy Odell | Southampton | Southampton | 11 Sep 21 | |
| 618 | 52.69 | | | 52.64/52.3 | | Matthew Smith | U17 | -6 | Jay Galley | Blackheath & Bromley | Eltham | 27 Jun 21 | |
| 619 | 52.70 | | | 52.70 | PB | Hugo Packman | U20 | -5 | Mark Vile | Cambridge & Coleridge | Watford | 25 Aug 21 | |
| 620 | 52.7 | | | 53.08/52.7 | PB | Oscar Logan | U17 | -6 | Patrick Kelly | Law | Wishaw | 5 Jun 21 | |
| 620 | 52.7 | | | 52.74/52.7 | PB | James Martin | U23 | -3 | Lynn Cooper | Houghton Harriers | Whitley Bay | 6 Jun 21 | |
| 52.74 | | | | | | | | | | Jarrow | 2 Jun 21 | |
| 620 | 52.7 | | | 47.84 | | Klaysen Kafuti | U17 | -8 | Paul Weston | Croydon | Battersea Park | 20 Jun 21 | |
| 620 | 52.7 | | | 50.14 | | Edward Laws | U20 | -6 | Norma Harris | Stevenage & North Herts | Ware | 20 Jun 21 | |
| 620 | 52.7 | | | 52.7 | PB | Oscar Hough | U17 | -6 | | London Schs | Lee Valley | 26 Jun 21 | |
| 620 | 52.7 | | | 51.00i | | Craig O'Brien | | 9 | Paul Waters | Wirral | Sportcity | 4 Jul 21 | |
| 620 | 52.7 | | | 52.67i | | Alexander Lione | | 1 | | Cambridge & Coleridge | Cambridge | 11 Jul 21 | |
| 52.94 | | | | | | | | | | Loughborough | 25 Apr 21 | |
| 620 | 52.7 | | | 50.25 | | Matthew Brown | U17 | -7 | Tyler Johnson | Jersey | St. Clement | 19 Aug 21 | |
| 620 | 52.7 | | | 53.13/52.7 | PB | Alex Leadbeater | U17 | -8 | | Leigh | Leigh | 15 Sep 21 | |
| 629 | 52.71 | | | 52.71 | PB | Fraser Morris | U20 | -5 | | Livingston | Livingston | 23 May 21 | |
| 629 | 52.71 | | | 48.60 | | Stewart Marshall | V40 | 19 | | Coventry | Nuneaton | 31 Jul 21 | |
| 631 | 52.72 | | | 52.09 | | Matthew Chandler | U23 | -2 | Colin Sinclair | Kilbarchan | Bedford | 29 May 21 | |
| 631 | 52.72 | | | 50.72 | | Sol Inglis | U17 | -7 | | Thames Valley | Lee Valley | 12 Jun 21 | |
| 631 | 52.72 | | | 50.34 | | Hal Rust-D'Eye | U17 | -8 | | Reading AC | Eton | 1 Aug 21 | |
| 631 | 52.72 | | | 49.16 | | Tom Grantham | V35 | 16 | John Henson | Sheffield & Dearne | Sheffield | 1 Aug 21 | |
| 635 | 52.73 | | | 52.25 | | Richard Arthurs | U20 | -4 | | Livingston | Aberdeen | 29 Aug 21 | |
| 636 | 52.74 | | | 52.74 | PB | Oliver Hill | U23 | -1 | | Highgate | Perivale | 15 Aug 21 | |
| 637 | 52.76 | | | 51.09 | | Scott Temple | U17 | -7 | John Spence | Hartlepool AC | Jarrow | 2 Jun 21 | |
| 638 | 52.77 | | | 49.98 | | Cameron Steven | U23 | -1 | Jamie Bowie | Lasswade | Sheffield | 3 May 21 | |
| 638 | 52.77 | | | 50.52 | | Harris Pentecost | U23 | -2 | John Pentecost | Falkirk | Grangemouth | 14 Aug 21 | |
| 640 | 52.79 | | | 52.79 | PB | Dominic Stapleton | U17 | -7 | | City of Salisbury | Yeovil | 20 Jun 21 | |
| 640 | 52.79 | | | 52.23 | | James Naylor | U23 | -3 | Roy Dickens | Blackheath & Bromley | Bromley | 13 Aug 21 | |
| 642 | 52.8 | | | 52.24 | | Bradley White | U20 | -6 | | Basingstoke & Mid Hants | Basingstoke | 1 May 21 | |
| 642 | 52.8 | | | 52.08 | | Ewan McArthur | U23 | -1 | Kevin Reynolds | Victoria Park City of Glasgow | Stirling | 15 May 21 | |
| 642 | 52.8 | | | 52.97/52.7 | | Karran Kapur-Walton | U20 | -4 | | Leigh | Sportcity | 6 Jun 21 | |
| 52.97 | | | | | | | | | | Stretford | 22 May 21 | |
| 642 | 52.8 | | | 52.8 | PB | Rafe Lochore | U20 | -4 | | Norfolk Schs | Norwich | 12 Jun 21 | |
| 642 | 52.8 | | | 53.97/52.8 | PB | Jacob Alley | U20 | -4 | James McDonald | Herne Hill | Battersea Park | 20 Jun 21 | |
| 642 | 52.8 | | | 53.75i/52.8 | PB | Jack Coates | U20 | -5 | | Northern (Isle of Man) | Douglas | 26 Jun 21 | |
| 642 | 52.8 | | | 51.30 | | Ernest Barnes | U17 | -7 | | Shaftesbury Barnet | Perivale | 27 Jun 21 | |
| 642 | 52.8 | | | 52.71/52.4 | | Liam Nixon | U20 | -6 | Graeme Gourlay | Poole AC | Yeovil | 4 Jul 21 | |
| 642 | 52.8 | | | 52.05 | | Harry Meredith | U23 | -3 | Colin Baross | Team Bath | Stourport | 8 Aug 21 | |
| 642 | 52.8 | | | 52.76/51.6 | | Daniel Venables-Buckley | U20 | -5 | Debbie Copper | Leigh | Leigh | 5 Sep 21 | |
| 652 | 52.83 | | | 52.83 | PB | Joshua Sterling-Nelson | U23 | -2 | John Herbert | Enfield & Haringey | Finsbury Park | 14 Aug 21 | |
| 652 | 52.83 | | | 52.69 | | Kester Welch | U20 | -5 | Jim Kidd | Taunton | Yeovil | 21 Aug 21 | |
| 654 | 52.84 | | | 52.84 | PB | Jack Raine | U20 | -6 | Jake Awe | Dacorum | Bromley | 24 May 21 | |
| 654 | 52.84 | | | 49.64 | | Harrison Garcia | U17 | -8 | | Llanelli | Brecon | 3 Jul 21 | |
| 656 | 52.85 | | | 51.44 | | Jamie Worman | U23 | -1 | Jade Surman | Birmingham Uni | Birmingham (U) | 12 May 21 | |
| 656 | 52.85 | | | 50.29 | | Adam Hoole | U20 | -5 | | Team East Lothian | Bedford | 29 May 21 | |
| 656 | 52.85 | | | 52.85 | PB | Charlie Scates | | 3 | | London Heathside | Mile End | 11 Jul 21 | |
| 659 | 52.86 | | | 52.86 | PB | Ash Fowkes-Gajan | U20 | -6 | Jeremy Sothcott | Shaftesbury Barnet | Hendon | 21 Aug 21 | |
| 660 | 52.87 | | | 52.87 | PB | Conor O’Keeffe | U20 | -5 | Colin Godfrey | Shaftesbury Barnet | Gillingham | 3 May 21 | |
| 660 | 52.87 | | | 52.87 | PB | Jabulani Sokoya | U23 | -1 | | Shaftesbury Barnet | Hendon | 31 Jul 21 | |
| 660 | 52.87 | | | 51.66/51.4 | | Adam Herring | | 3 | | Blackheath & Bromley | Bromley | 11 Sep 21 | |
| 663 | 52.88 | | | 52.88/52.0 | PB | Josef Wilson | U20 | -6 | Andy Bibby | Preston | Stretford | 8 Jun 21 | |
| 663 | 52.88 | | | 52.88 | PB | Arlo Ludewick | U23 | -2 | Norman Poole | Herne Hill | Kingston | 3 Jul 21 | |
| 665 | 52.89 | | | 47.67 | | Demari Gumbs | U17 | -8 | Thomas Presho | Windsor Slough Eton & Hounslow | Bedford | 18 Sep 21 | |
| 666 | 52.90 | | | 49.99 | | Matthew Billington | | 2 | Linford Christie | Southampton | Crawley | 31 Jul 21 | |
| 667 | 52.9 | | | 53.25/52.9 | PB | Sam Elwood | U20 | -5 | | Reading AC | Reading | 2 May 21 | |
| 667 | 52.9 | | | 52.9 | PB | John Fenley | U17 | -7 | | Gloucester | Gloucester | 16 May 21 | |
| 667 | 52.9 | | | 53.81/52.9 | PB | Luke Phillips | U20 | -4 | Tim Needham | Peterborough & Nene Valley | Peterborough | 16 May 21 | |
| 667 | 52.9 | | | 50.46 | | Ben Grant | U23 | -1 | David Lothian | Falkirk | Grangemouth | 20 May 21 | |
| 667 | 52.9 | | | 52.9 | PB | Joseph Boyle | U20 | -5 | | Skyrac | Cleckheaton | 19 Jun 21 | |
| 667 | 52.9 | | | 49.95 | | George Asprey | U20 | -5 | Rafer Joseph | Aldershot, Farnham & District | Lee Valley | 26 Jun 21 | |
| 52.95 | | | | | | | | | | Bedford | 29 May 21 | |
| 667 | 52.9 | | | 52.9 | PB | Scott Sinclair | U20 | -6 | Caroline Warden | Preston | Ellesmere Port | 27 Jun 21 | |
| 667 | 52.9 | | | 53.72/52.9 | PB | Jude Miranda | U20 | -4 | | Shaftesbury Barnet | Perivale | 27 Jun 21 | |
| 667 | 52.9 | | | 53.07/52.9 | PB | Henry Cullen | U20 | -6 | David Blackburn | Doncaster | Sheffield | 27 Jun 21 | |
| 667 | 52.9 | | | 51.97 | | Peter Braybrook | U20 | -6 | Bill Boyd | Corby | Corby | 20 Jul 21 | |
| 667 | 52.9 | | | 52.7 | | Ben Makin | U20 | -4 | | Blackburn | Blackburn | 25 Jul 21 | |
| 667 | 52.9 | | | 49.09 | | Lea Stephenson | V35 | 13 | Doug Maxwell | Tynedale | Jarrow | 2 Aug 21 | |
| 667 | 52.9 | | | 51.91/51.1 | | Abraham Jones | U23 | -2 | Tim Needham | Peterborough & Nene Valley | Peterborough | 14 Aug 21 | |
| 667 | 52.9 | | | 57.76/52.9 | PB | Oliver Park | | 11 | Mark Vile | Cambridge & Coleridge | Bury St. Edmunds | 5 Sep 21 | |
| 667 | 52.9 | | | 51.67 | | Daniel Harrison | U20 | -6 | Rob Andrews | Great Yarmouth | Norwich | 5 Sep 21 | |
| 682 | 52.91 | | | 50.37 | | Oliver Blainey | U17 | -7 | Nat Senior | Ilford | Grays | 11 Sep 21 | |
| 683 | 52.92 | | | 52.61 | | Joshua Geddes | U20 | -5 | Shane Smith | Kettering | Kettering | 6 Jul 21 | |
| 683 | 52.92 | | | 51.59i | | Chuka Akunna | U20 | -4 | | Dundee Hawkhill | Grangemouth | 18 Jul 21 | |
| 685 | 52.93 | | | 50.75 | | Kyle Magwood | U23 | -2 | | Bristol & West | Yate | 6 Jun 21 | |
| 685 | 52.93 | | | 52.93 | PB | Finn Rodgers | U20 | -5 | Steven Munday | Medway & Maidstone | Eltham | 27 Jun 21 | |
| 687 | 52.94 | | | 52.69i | | Jacob Luc | U20 | -6 | | Giffnock North | Aberdeen | 29 Aug 21 | |
| 687 | 52.94 | | | 52.94 | PB | Jordan Gombas | | 2 | | Southend | Stratford (CT) | 12 Sep 21 | |
| 689 | 52.95 | | | 49.89 | | Steven Tester | V35 | 17 | Iain Presnell | Tonbridge | Eltham | 11 Jul 21 | |
| 689 | 52.95 | | | 51.47 | | Ryan Keenan | | 1 | Ian Neely | City of Lisburn | Belfast | 31 Jul 21 | |
| 691 | 52.96 | | | 52.96 | PB | Edward Docherty | U17 | -7 | Emma Forster | Inverclyde | Grangemouth | 13 Jun 21 | |
| 692 | 52.98 | | | 52.67 | | Franceso Buono | U20 | -5 | | Cardiff Archers | Swansea | 27 Jun 21 | |
| 693 | 53.00 | | | 49.87 | | Jamie Phillips | U17 | -7 | | Kilmarnock | Livingston | 6 Aug 21 | |
| 694 | 53.0 | | | 53.94i/53.0 | PB | Elliot Wilkins | U20 | -5 | | Dunfermline Track & Field | Dunfermline | 9 May 21 | |
| 694 | 53.0 | | | 52.32 | | Harvey Butler | U20 | -4 | | Jersey | St. Clement | 27 May 21 | |
| 694 | 53.0 | | | 52.13 | | Matthew Gillon | U20 | -4 | Patrick Kelly | Law | Wishaw | 5 Jun 21 | |
| 694 | 53.0 | | | 53.0 | PB | Oscar Tranter | U17 | -7 | | Hertfordshire Schs | Hemel Hempstead | 12 Jun 21 | |
| 694 | 53.0 | | | 50.63 | | Alexander Bell | U23 | -2 | | Manx | Douglas | 26 Jun 21 | |
| 694 | 53.0 | | | 55.47/53.0 | PB | Logan Shaw | U20 | -5 | | Lancaster & Morecambe | Lancaster | 3 Jul 21 | |
| 694 | 53.0 | | | 53.0 | PB | Michael Dobson | U17 | -7 | | St. Helens Sutton | Sportcity | 4 Jul 21 | |
| 694 | 53.0 | | | 53.31/53.0 | PB | Leo Cossham | U23 | -1 | John Rothwell | Hallamshire | York | 1 Aug 21 | |
| 694 | 53.0 | | | 51.16 | | Luke Francis | | 4 | Jon Armstrong | Bexley | Erith | 14 Aug 21 | |
| 46.26 | | | 45.41 | | Sadam Koumi | | 5 | Tony Hadley | Birchfield H | Tokyo, JPN | 1 Aug 21 | |
| 46.43 | | | 46.05 | | Chris O'Donnell | | 1 | Michael Baker | Newham & Essex Beagles | Dublin (S), IRL | 26 Jun 21 | |
| 46.64 | i | | 45.14 | | Victor-Ricardo Dos Santos Soares | | 5 | Linford Christie | Thames Valley | Ostrava, CZE | 3 Feb 21 | |
| 46.83 | | | | | | | | | | Tokyo, JPN | 1 Aug 21 | |
| 46.92 | | | 46.92 | PB | Thomas Corel | U23 | -1 | David Sadkin | Belgrave | Bromley | 13 Aug 21 | |
| 47.04 | | | 45.23 | | Luke Lennon-Ford | | 10 | David Sadkin | Thames Valley | Bromley | 13 Aug 21 | |
| 47.26 | i | | 47.26i | PB | Thomas Pitkin | | 1 | Linford Christie | Havering | South Bend IL, USA | 3 Dec 21 | |
| 47.61 | | | | | | | | | | Raleigh NC, USA | 26 Mar 21 | |
| 47.42 | | | 47.13 | | Nabil Tezkratt | U20 | -5 | Gladys Bird | Woodford Green Essex Ladies | Hendon | 28 Aug 21 | |
| 47.66 | | | 46.96 | | Zak Curran | | 6 | Lewis Moses | Windsor Slough Eton & Hounslow | Tullamore, IRL | 15 Aug 21 | |
| 47.68 | | | 46.80 | | Andrew Mellon | | 4 | | Liverpool H | Dublin (S), IRL | 25 Jun 21 | |
| 47.95 | | | 46.12 | | Adrien Coulibaly | | 3 | Chris Zah | Harrow | Stratford (CT) | 13 Jun 21 | |
| 48.17 | | | 47.31 | | Craig Newell | | 2 | | Liverpool H | Belfast | 11 Sep 21 | |
| 48.25 | | | 48.08 | | Tope Adeyeye | | 1 | | Enfield & Haringey | Dagenham | 29 May 21 | |
| 48.34 | | | 48.34 | PB | Muhammad Kounta | | 5 | | Thames Valley | Loughborough | 23 May 21 | |
| 48.78 | | | 48.15 | | Adam Hughes | U23 | -2 | Ian Neely | City of Lisburn | Dublin (S), IRL | 13 Jun 21 | |
| 48.88 | | | 48.88 | PB | Scott Gibson | | 2 | | Cardiff Met Uni | Belfast | 22 May 21 | |
| 48.98 | | | 48.98 | PB | Orukpe Eraiyokan | | 6 | | Windsor Slough Eton & Hounslow | Eton | 7 Aug 21 | |
| 49.01 | | | 48.41 | | Frederick Afrifa | | 3 | | Crawley | Stratford (CT) | 13 Jun 21 | |
| 49.39 | | | 49.39 | PB | Cheuk Wai Yee | U23 | -2 | | | Hang Hau, HKG | 22 May 21 | |
| 49.42 | | | 48.70i | | Eoghan Buggy | | 4 | | Cardiff | Belfast | 29 May 21 | |
| 49.61 | | | 49.61 | PB | Marcos Dion | | 1 | | Sale Harriers Manchester | Birmingham (U) | 12 May 21 | |
| 49.62 | | | 48.25i | | Paul Scanlan | | 6 | | Woodford Green Essex Ladies | Stratford (CT) | 12 Sep 21 | |
| 49.69 | | | 49.69 | PB | Dion Marcos | | 1 | | Sale Harriers Manchester | Nuneaton | 16 May 21 | |
| 49.84 | | | 48.37 | | Panashe Majuru | | 1 | Joe Caines | Birchfield H | Nuneaton | 4 Jul 21 | |
| 50.02 | | | 50.02 | PB | Callum Parker | | 1 | Phillip Kissi | Blackheath & Bromley | Lee Valley | 25 Apr 21 | |
| 50.07 | | | 48.45 | | Damaine Benjamin | | 11 | Simon Duberley | Harrow | Milton Keynes | 31 Jul 21 | |
| 50.65 | | | 50.65 | PB | Ahmed Farah | | 2 | John Wood | Sheffield & Dearne | Rotherham | 22 May 21 | |
| 50.8 | | | 50.86/50.4 | | Daniel Eugene | | 3 | Eric Phillips | Medway & Maidstone | Ashford | 11 Sep 21 | |
| 51.20 | | | 49.27 | | Connor Henderson | | 7 | Chris Baillie | Glasgow City | Grangemouth | 13 Jun 21 | |
| 51.22 | | | 48.40 | | Jamie Pender | | 1 | | Cardiff | Yate | 7 Aug 21 | |
| 51.29 | | | 48.33 | | Kacper Matysiak | U17 | -6 | Darren Lewis | Tipton | Sportcity | 8 Aug 21 | |
| 51.37 | | | 51.37 | PB | Josh Nairne | U23 | -1 | | Brighton Phoenix | Crawley | 30 Aug 21 | |
| 51.39 | | | 49.79 | | Finn O'Neill | U17 | -7 | Wendy Phillips | Lifford Strabane | Belfast | 29 May 21 | |
| 51.45 | | | 51.45 | PB | Matheus Lemes | U20 | -4 | | Kingston & Poly | Carshalton | 27 Jun 21 | |
| 51.5 | | | 50.35 | | Marco Siniscalchi | | 5 | | Oxford Uni | Horspath | 12 Jun 21 | |
| 51.71 | | | 47.97 | | Adam Courtney | U17 | -7 | Dougie Thom | Ballymena & Antrim | Dublin (S), IRL | 11 Sep 21 | |
| 52.12 | | | 49.47 | | Frano Vainio-Doiseul | | 3 | Martyn Jones | Cambridge H | Eltham | 11 Jul 21 | |
| 52.13 | | | 51.31 | | Tomasz Kosciuszko | | 2 | | Cambridge Uni | Lee Valley | 4 Jul 21 | |
| 52.14 | | | 52.14 | PB | Abdelkarim Touati | | 4 | | Telford AC | Nuneaton | 11 Apr 21 | |
| 52.36 | | | 50.00 | | Kaspars Kazemaks | V35 | 15 | Nick Phipps | Woking | Bracknell | 11 Jul 21 | |
| 52.47 | | | 51.43 | | Luc Brewin | U20 | -4 | | Loughborough Students | Bedford | 29 May 21 | |
| 52.49 | | | 50.91 | | You Li | U23 | -2 | David Sadkin | Belgrave | Shanghai, CHN | 21 Aug 21 | |
| 52.59 | | | 49.07 | | Shane Hudson T47 | V35 | 14 | Coral Nourrice | Thames Valley | Lee Valley | 10 Apr 21 | |
| 52.81 | | | 51.06 | | Jack Nicholls | U23 | -2 | | Cambridge & Coleridge | Loughborough | 23 Jun 21 | |
| 52.81 | i | | 50.15 | | Giuseppe Bonifacio | U23 | -1 | | King's College London | Lee Valley | 20 Nov 21 | |