| 300 Women Overall 2021 to 44.0 | Head to Head Top 10 |
| Rank | Perf | | | PB | | Name | | Year | Coach | Club | Venue | Date | |
| 1 | 37.24 | | | 36.97i | | Laviai Nielsen | | 3 | Christine Harrison-Bloomfield | Enfield & Haringey | Lee Valley | 10 Apr 21 |  |
| 2 | 37.38 | | | 37.38 | PB | Desiree Henry | | 4 | Mike McFarlane | Enfield & Haringey | Lee Valley | 25 Apr 21 | |
| 3 | 38.12 | | | 38.12 | PB | Louise Evans | U23 | -2 | Linford Christie | Blackheath & Bromley | Lisbon, POR | 25 Apr 21 | |
| 4 | 38.28 | | | 38.28 | PB | Etty Sisson | U17 | -7 | Grant Barker | Charnwood | Derby | 25 Sep 21 | |
| 5 | 38.37 | | | 37.68i | | Yemi Mary John | U20 | -5 | Alan James | Woodford Green Essex Ladies | Lee Valley | 25 Apr 21 | |
| 6 | 39.03 | | | 37.81i | | Rebecca Grieve | U17 | -7 | Francis Smith | Pitreavie | Sportcity | 8 Aug 21 | |
| 7 | 39.10 | | | 37.60i | | Charlotte Henrich | U17 | -8 | Carlo Monticolombi | Invicta East Kent | Loughborough | 4 Sep 21 | |
| 8 | 39.19 | | | 39.19 | PB | Jessica Astill | U17 | -7 | Paul Keeble | Stevenage & North Herts | Sportcity | 8 Aug 21 | |
| 9 | 39.29 | | | 39.29 | PB | Grace Pritchard | U17 | -7 | Donald Moss | Wigan & District | Sportcity | 8 Aug 21 | |
| 10 | 39.31 | | | 39.31 | PB | Sofia Vidak | U17 | -6 | Norrie Hay | Falkirk | Sportcity | 7 Aug 21 | |
| 11 | 39.51 | | | 37.59 | | Cheriece Hylton | | 3 | Christine Harrison-Bloomfield | Blackheath & Bromley | Bromley | 24 May 21 | |
| 11 | 39.51 | | | 38.52i | | Nandy Kihuyu | U17 | -7 | Charlene Thomas | Hallamshire | Sportcity | 10 Jul 21 | |
| 13 | 39.71 | | | 38.59i | | Callia Downey | U15 | -8 | TJ Ossai | BFT Track Academy | Sportcity | 11 Jul 21 | |
| 14 | 39.76 | i | | 39.68i | | Isabella Hilditch | U23 | -1 | John Blackie | Blackheath & Bromley | Princeton NJ, USA | 12 Dec 21 | |
| 15 | 39.86 | i | | 39.20i | | Hannah Kelly | U23 | -2 | Les Hall | Bolton | Sportcity | 19 Dec 21 | |
| 16 | 39.9 | | | 39.53 | | Stephanie Okoro | U17 | -8 | Tony Benton | Havering | Basildon | 12 Sep 21 | |
| 40.44 | | | | | | | | | | Chelmsford | 12 Jun 21 | |
| 17 | 40.12 | i | | 39.10 | | Caryl Moore | | 10 | Darrell Maynard | Swansea | Cardiff | 19 Dec 21 | |
| 18 | 40.13 | | | 39.95 | | Aaliyah McCloud | U15 | -8 | | Central | Aberdeen | 28 Aug 21 | |
| 19 | 40.2 | | | 44.65/40.2 | PB | Eleanor Colbourn | U17 | -6 | Joanne Day | Harrogate | Middlesbrough | 16 May 21 | |
| 20 | 40.23 | | | 40.23 | PB | Olivia Boachie | U17 | -7 | Tony Benton | Havering | Sportcity | 10 Jul 21 | |
| 21 | 40.27 | | | 40.27 | PB | Rachel Donnison | | 3 | Bob Bridges | Cardiff | Wormwood Scrubs | 12 May 21 | |
| 22 | 40.35 | i | | 39.81i | | Zoe Hughes | | 1 | | Havering | Blacksburg VA, USA | 15 Jan 21 | |
| 22 | 40.35 | | | 40.35 | PB | Favour Joseph | U17 | -8 | Anita Richardson | Sale Harriers Manchester | Sportcity | 10 Jul 21 | |
| 22 | 40.35 | | | 39.64 | | Camiah Bennett | U15 | -9 | Brian Darby | Coventry | Sportcity | 11 Jul 21 | |
| 25 | 40.36 | | | 39.38 | | Arabella Wilson | U15 | -8 | Andrew Fisher | Winchester | Sportcity | 11 Jul 21 | |
| 26 | 40.48 | | | 39.27 | | Casey Musgrave | U15 | -9 | Mark Fowler | Hallamshire | Sportcity | 8 Aug 21 | |
| 27 | 40.51 | | | 38.46 | | Hannah Foster | U20 | -4 | Craig Andrew | Shaftesbury Barnet | Dagenham | 25 Apr 21 | |
| 28 | 40.52 | | | 40.52 | PB | Michelvi Wamba | U17 | -7 | Alf Vickers | Victoria Park & Tower Hamlets | Lee Valley | 30 Aug 21 | |
| 29 | 40.53 | | | 39.94 | | Chelsea Fagan | U17 | -8 | | Notts | Sportcity | 10 Jul 21 | |
| 30 | 40.68 | | | 40.65 | | Annalise Agyei-Kyem | U17 | -8 | Andrew Kennard | Walton | Lee Valley | 30 Aug 21 | |
| 31 | 40.74 | | | 40.59 | | Beth Pringle | | 2 | Janice Kaufman | Gateshead | Jarrow | 28 Apr 21 | |
| 32 | 40.77 | | | 40.77 | PB | Monica Davidson | U17 | -8 | Brian Darby | Coventry | Sportcity | 10 Jul 21 | |
| 33 | 40.80 | | | 40.55 | | Angelique Abberley | U17 | -7 | | Rotherham | Sportcity | 10 Jul 21 | |
| 34 | 40.8 | | | 39.65 | | Sophie Wallwork | U17 | -7 | Dave Combe | Dundee Hawkhill | Dundee | 6 Jun 21 | |
| 42.36 | | | | | | | | | | Grangemouth | 13 Jun 21 | |
| 35 | 40.81 | i | | 40.00i | | Emma Alderson | U23 | -2 | Nick Dakin | Liverpool H | Sportcity | 19 Dec 21 | |
| 36 | 40.86 | | | 40.40 | | Lucy Fellows | U17 | -6 | | St. Mary's Richmond | Yeovil | 1 May 21 | |
| 36 | 40.86 | i | | 39.56i | | Laura Turley | | 2 | Trevor Painter | West Cheshire | Sportcity | 19 Dec 21 | |
| 38 | 40.89 | | | 40.89 | PB | Molly Firth | U17 | -7 | | Halifax | Sheffield | 9 Jun 21 | |
| 39 | 40.9 | | | 39.46 | | Sofia Barrett | U15 | -8 | | Corby | Corby | 8 Jun 21 | |
| 42.12 | | | | | | | | | | Nuneaton | 1 May 21 | |
| 40 | 40.97 | | | 39.67 | | Freya Vidal | U15 | -8 | Paul Daynes | City of York | Grimsby | 22 Aug 21 | |
| 41 | 41.00 | | | 40.25 | | Imogen Pughe | U17 | -7 | | West Cheshire | Hull | 14 Aug 21 | |
| 42 | 41.02 | i | | 38.61 | | Niamh Le'Gall | U17 | -9 | Andrew Cross | Wirral | Sportcity | 19 Dec 21 | |
| 41.04 | | | | | | | | | | Stretford | 30 Aug 21 | |
| 43 | 41.05 | | | 40.75 | | Ella Wintle | U17 | -6 | | Pembrokeshire | Brecon | 3 Jul 21 | |
| 43 | 41.05 | i | | 41.05i | PB | Ffion Mair Roberts | U23 | -2 | Barry Edwards | Cardiff | Sportcity | 5 Dec 21 | |
| 45 | 41.08 | i | | 41.08i | PB | Lily Murphy | U17 | -8 | Wendy Andrews | East Cheshire | Sportcity | 5 Dec 21 | |
| 41.35 | | | | | | | | | | Stretford | 5 Sep 21 | |
| 46 | 41.10 | | | 41.10 | PB | Ruby Brook | U17 | -7 | Mark Wanklyn | Cheltenham | Nuneaton | 19 Jun 21 | |
| 47 | 41.1 | | | 39.35i/38.9 | | Kara Dacosta | U15 | -9 | Caerwen Butler | Basildon | Dartford | 17 Jul 21 | |
| 42.22 | | | | | | | | | | Sportcity | 7 Aug 21 | |
| 48 | 41.11 | | | 41.11 | PB | Anna Gisbourne | U15 | -9 | | Bury | Stretford | 30 Aug 21 | |
| 49 | 41.12 | | | 41.12 | PB | Anna Babis | U17 | -8 | Simon Duberley | Windsor Slough Eton & Hounslow | Eton | 31 Jul 21 | |
| 49 | 41.12 | i | | 40.42 | | Havana Allistone-Greaves | U23 | -3 | | Herne Hill | Madrid, ESP | 19 Dec 21 | |
| 51 | 41.17 | | | 41.17 | PB | Amarisa Sibley | U17 | -7 | Jon Bigg | Blackheath & Bromley | Bromley | 30 May 21 | |
| 52 | 41.19 | | | 41.19 | PB | Phoebe Clayton | U17 | -8 | Owen McNally | Rushcliffe | Sportcity | 10 Jul 21 | |
| 53 | 41.20 | | | 40.54 | | Mia Walker | U15 | -9 | Andrew Fraser | Wirral | Stretford | 31 May 21 | |
| 54 | 41.21 | | | 41.19i | | Madison Murdoch | U17 | -7 | Angela Young | Larkhall | Grangemouth | 15 Aug 21 | |
| 55 | 41.27 | i | | 40.58 | | Millie Hardy | U17 | -8 | Martin Bishell | Hallamshire | Sheffield | 11 Dec 21 | |
| 56 | 41.30 | | | 41.30 | PB | Kathryn Sutton | | 11 | Gerald Patrick | Dartford H | Stratford (CT) | 12 Sep 21 | |
| 57 | 41.37 | | | 40.93 | | Tamsin Fowlie | U17 | -6 | Steven Murray | Elgin | Inverness | 25 Jul 21 | |
| 58 | 41.40 | i# | | 41.40i | PB | Elizabeth Ibidunni | U23 | -1 | | Blackheath & Bromley | Maryville MO, USA | 4 Dec 21 | |
| 59 | 41.42 | | | 41.42 | PB | Lucy Wintle | U17 | -8 | | Pembrokeshire | Aberdare | 15 May 21 | |
| 60 | 41.46 | i | | 40.10 | | Tia Anderson | U20 | -4 | Peter Wileman | Durham | Sheffield | 11 Dec 21 | |
| 61 | 41.49 | | | 40.43 | | Katie Evans | U17 | -7 | Dean Exton | Dorchester | Plymouth | 9 May 21 | |
| 62 | 41.50 | | | 40.34 | | Lucy Poole | U17 | -7 | Gary Tunstall | Preston | Sportcity | 7 Aug 21 | |
| 63 | 41.5 | | | 40.89 | | Gracelyn Kendeck | U15 | -9 | Paul Weston | Croydon | Carshalton | 5 Jun 21 | |
| 41.66 | | | | | | | | | | Battersea Park | 4 Sep 21 | |
| 63 | 41.5 | | | 42.00/41.3 | | Ayomide Cole | U17 | -7 | | Basingstoke & Mid Hants | Bracknell | 15 Aug 21 | |
| 65 | 41.54 | | | 41.54 | PB | Cassie Southgate | U15 | -9 | | Hillingdon | Wormwood Scrubs | 5 Jun 21 | |
| 65 | 41.54 | | | 41.10i | | Ella Darby | U15 | -9 | James Wright | Rugby & Northampton | Sportcity | 11 Jul 21 | |
| 65 | 41.54 | i | | 41.06 | | Bea Green | U20 | -4 | Martin Cook | Ipswich | Sheffield | 11 Dec 21 | |
| 68 | 41.58 | | | 41.55 | | Callie Coates | U17 | -7 | Les Grant | Doncaster | Doncaster | 5 Sep 21 | |
| 69 | 41.60 | | | 40.20 | | Isabelle Lowe | U15 | -9 | Nick Marley | Guernsey | St. Peter Port | 30 May 21 | |
| 69 | 41.60 | | | 41.60 | PB | Nia McConnell | U15 | -9 | Dean Exton | Dorchester | Yeovil | 18 Sep 21 | |
| 71 | 41.63 | | | 40.85 | | Isabelle Asante | U17 | -7 | Darren Lewis | Tipton | Nuneaton | 22 Aug 21 | |
| 72 | 41.64 | | | 41.64 | PB | Abigail Rickard | U17 | -7 | Sharon Morris | Birchfield H | Nuneaton | 19 Jun 21 | |
| 72 | 41.64 | | | 41.07 | | Anais Shepperd | U15 | -9 | Helen Patricia James | Cardiff | Newport | 26 Jun 21 | |
| 72 | 41.64 | | | 40.98i | | Shayna Asamoah | U15 | -8 | Agustin Paniagua Osorio | Dunfermline Track & Field | Dunfermline | 21 Aug 21 | |
| 75 | 41.65 | | | 41.65/40.7 | PB | Hannah Malpass | U23 | -1 | Shaun Ainge | Cannock & Stafford | Jarrow | 28 Apr 21 | |
| 76 | 41.66 | i | | 39.26 | | Emma Holmes | U17 | -8 | | West Cheshire | Sportcity | 19 Dec 21 | |
| 42.89 | | | | | | | | | | Ellesmere Port | 21 Aug 21 | |
| 77 | 41.68 | | | 41.68 | PB | Nicole McGovern | U17 | -7 | Idris Hamud | Shaftesbury Barnet | Hendon | 31 Jul 21 | |
| 78 | 41.69 | i | | 41.69i | PB | Louise Robinson | U23 | -2 | Joe Caines | Birchfield H | Cardiff | 1 Dec 21 | |
| 79 | 41.70 | i | | 40.53 | | Olivia Kimbowa | U23 | -3 | Les Hall | Bolton | Cardiff | 1 Dec 21 | |
| 80 | 41.75 | | | 41.25 | | Chloe Hill | U15 | -8 | Angela Young | Larkhall | Aberdeen | 28 Aug 21 | |
| 80 | 41.75 | i | | 41.55 | | Frances Hogg | U17 | -7 | Craig Pounder | City of York | Sheffield | 11 Dec 21 | |
| 41.94 | | | | | | | | | | Sheffield | 18 Apr 21 | |
| 43.4 | | | | | | | | | | York | 13 Jun 21 | |
| 82 | 41.8 | | | 41.97/41.8 | PB | Lizzie Garner | U15 | -8 | Sharon Edghill | Marshall Milton Keynes | Milton Keynes | 12 Jun 21 | |
| 42.03 | | | | | | | | | | Sportcity | 11 Jul 21 | |
| 82 | 41.8 | | | 41.95/40.9 | | Uche Okpalauko | U17 | -6 | Darren Priestley | Havering | Basildon | 12 Sep 21 | |
| 41.95 | | | | | | | | | | Chelmsford | 31 Jul 21 | |
| 84 | 41.82 | | | 41.14 | | Elsa Thompson | U17 | -7 | Robert Hadfield | Kingston upon Hull | Stretford | 24 Apr 21 | |
| 84 | 41.82 | | | 41.82 | PB | Jemima Robinson | U17 | -7 | Anthony Lee | Cardiff | Aberdare | 25 Jul 21 | |
| 86 | 41.87 | | | 40.76 | | Ava John | U15 | -9 | | Windsor Slough Eton & Hounslow | Wormwood Scrubs | 5 Jun 21 | |
| 87 | 41.89 | | | 41.89 | PB | Liana Williams | U17 | -7 | Lesley Pearson | Windsor Slough Eton & Hounslow | Eton | 16 May 21 | |
| 87 | 41.89 | | | 41.57/41.5 | | Imogen Wilson | U17 | -8 | Ken Spencer | Bracknell AC | Eton | 31 Jul 21 | |
| 89 | 41.9 | | | 42.02i/41.9 | PB | Skye Verwey | U20 | -4 | | Marshall Milton Keynes | Corby | 20 Jul 21 | |
| 42.02 | i | | | | | | | | | Lee Valley | 5 Dec 21 | |
| 89 | 41.9 | | | 42.26i/41.8 | | Mia Wainwright | U17 | -8 | Shaun Ainge | Cannock & Stafford | Telford | 25 Jul 21 | |
| 42.42 | | | | | | | | | | Nuneaton | 22 Aug 21 | |
| 89 | 41.9 | | | 41.9 | PB | Emily Lucas | U15 | -9 | Adrian Weston | Aldershot, Farnham & District | Winchester | 19 Sep 21 | |
| 92 | 41.95 | | | 41.95 | PB | Stephanie Fisher | U23 | -2 | | Blackheath & Bromley | Gillingham | 3 May 21 | |
| 92 | 41.95 | | | 39.80 | | Anne-Sophie Bremans | U17 | -8 | | Tonbridge | Ashford | 12 Jun 21 | |
| 92 | 41.95 | | | 41.75 | | Zahara Malcolm | U17 | -6 | Gladys Bird | Woodford Green Essex Ladies | Chelmsford | 31 Jul 21 | |
| 95 | 41.96 | | | 41.96 | PB | Sade Fajuke | U17 | -7 | | Victoria Park & Tower Hamlets | Basildon | 5 Sep 21 | |
| 96 | 41.99 | | | 41.99 | PB | Maya Stewart | U17 | -6 | Mike Bennett | Worcester | Nuneaton | 19 Jun 21 | |
| 96 | 41.99 | i | | 41.99i | PB | Mena Scatchard | U20 | -5 | Kieron Hall | Leeds City | Princeton NJ, USA | 12 Dec 21 | |
| 96 | 41.99 | i | | 41.99i | PB | Rosella Togo | U20 | -6 | Matt Cullen | Bury | Sportcity | 19 Dec 21 | |
| 99 | 42.0 | | | 41.75 | | Amber Bailey | U17 | -7 | Les Rayment | Bracknell AC | Reading | 12 Jun 21 | |
| 42.25 | | | | | | | | | | Sportcity | 10 Jul 21 | |
| 99 | 42.0 | | | 41.91/41.7 | | Sophie Forbes-Laird | U17 | -7 | James Webster | Shaftesbury Barnet | Sandy | 16 Jun 21 | |
| 42.33 | | | | | | | | | | Hendon | 5 Sep 21 | |
| 101 | 42.05 | | | 42.05 | PB | Hannah Kinane | U17 | -8 | | Swansea | Gothenburg, SWE | 11 Jul 21 | |
| 102 | 42.06 | | | 41.44 | | Therese Tolan | U17 | -6 | Charlene Thomas | Harrogate | Middlesbrough | 20 Jun 21 | |
| 103 | 42.07 | | | 41.00 | | Lily Bailey | U17 | -6 | Jonathan Jackson | Bristol & West | Yate | 25 Jul 21 | |
| 104 | 42.10 | | | 41.38 | | Daisy Snell | U15 | -9 | | Blackheath & Bromley | Eltham | 5 Jun 21 | |
| 105 | 42.1 | | | 41.50/40.7 | | Poppy Northcott | U15 | -8 | Neal Edwards | City of Plymouth | Par | 21 Aug 21 | |
| 42.11 | | | | | | | | | | Tavistock | 15 Aug 21 | |
| 105 | 42.1 | | | 42.43/42.1 | PB | Ellie Knobel | U15 | -8 | | Banbury | Nuneaton | 29 Aug 21 | |
| 42.43 | | | | | | | | | | Horspath | 11 Sep 21 | |
| 105 | 42.1 | | | 43.03/42.1 | PB | Olivia Mensah | U17 | -7 | | Walton | Walton | 5 Sep 21 | |
| 105 | 42.1 | | | 42.1 | PB | Lily T-Smith | U17 | -7 | David McManus | New Forest Junior | Bournemouth | 12 Sep 21 | |
| 109 | 42.11 | | | 42.11 | PB | Estelle Roots | U17 | -7 | Stephen Cottle | Torbay | Plymouth | 1 Aug 21 | |
| 110 | 42.14 | | | 38.97i | | Ella Blakey | U23 | -1 | John Henson | Derby | Sheffield | 3 May 21 | |
| 110 | 42.14 | | | 42.14 | PB | Krystle Balogun | | 12 | Nat Senior | Ilford | Stratford (CT) | 12 Sep 21 | |
| 112 | 42.15 | | | 42.15 | PB | Niamh Cox | U15 | -8 | Darren Lewis | Tipton | Sportcity | 11 Jul 21 | |
| 113 | 42.18 | | | 42.18 | PB | Sian Popham | U17 | -7 | Andrew Kennard | Walton | Kingston | 31 Jul 21 | |
| 113 | 42.18 | | | 39.10 | | Daniella Bleach | U15 | -8 | Brian Darby | Coventry | Coventry | 4 Sep 21 | |
| 115 | 42.19 | | | 40.86i | | Amy Greig | U17 | -6 | | St. Mary's Richmond | Dagenham | 29 May 21 | |
| 116 | 42.2 | | | 42.64/42.2 | PB | Elena Bartalotta | U15 | -9 | | Salford H | Eccles | 5 Jun 21 | |
| 42.64 | | | | | | | | | | Stretford | 15 May 21 | |
| 117 | 42.21 | | | 41.36/41.3 | | Sophie Anderson | U20 | -5 | Colin Corless | Southend | Woodford | 22 May 21 | |
| 117 | 42.21 | | | 41.22 | | Annabel Howells | U17 | -8 | Paul Keeble | Stevenage & North Herts | Stevenage | 18 Sep 21 | |
| 119 | 42.26 | | | 41.11 | | Nia Harrison Sargent | U15 | -9 | Charlene Thomas | Halifax | Stretford | 31 May 21 | |
| 119 | 42.26 | | | 41.46i | | Codie Mcholm | U17 | -7 | Angela Young | Larkhall | Grangemouth | 14 Aug 21 | |
| 121 | 42.28 | | | 40.19/40.1 | | Caitlyn Harvey | U17 | -8 | | Kingston & Poly | Kingston | 31 Jul 21 | |
| 122 | 42.29 | | | 42.29 | PB | Elsa McCallum | U17 | -7 | | Willowfield | Dublin (S), IRL | 11 Sep 21 | |
| 123 | 42.3 | | | 42.35i/42.3 | PB | Hermione Mason | U17 | -7 | Alexander Wort | Sale Harriers Manchester | Leigh | 30 May 21 | |
| 42.35 | i | | | | | | | | | Sportcity | 5 Dec 21 | |
| 43.29 | | | | | | | | | | Ellesmere Port | 21 Aug 21 | |
| 123 | 42.3 | | | 41.47 | | Thalia Mann | U15 | -10 | Imogen Louise Walker | Watford | Hemel Hempstead | 12 Jun 21 | |
| 123 | 42.3 | | | 42.3 | PB | Eleni Francis | U17 | -6 | Paul Weston | Team Bath | Gloucester | 1 Aug 21 | |
| 123 | 42.3 | | | 44.21i/42.3 | PB | Sophie Evans | U17 | -7 | Thomas McTaggart | Law | Carluke | 5 Sep 21 | |
| 127 | 42.31 | | | 41.62 | | Cameron Kelly-Gordon | U17 | -7 | | Blackheath & Bromley | Ashford | 12 Jun 21 | |
| 127 | 42.31 | | | 42.14 | | Lois Creasey | U17 | -7 | David Howells | Middlesbrough (Mandale) | Middlesbrough | 22 Aug 21 | |
| 127 | 42.31 | | | 42.30/41.9 | | Christina Kirkby | U17 | -8 | Virginia Mitchell | Guildford & Godalming | Portsmouth | 25 Sep 21 | |
| 130 | 42.35 | | | 42.35 | PB | Kate Bain | U17 | -7 | Alun Williams | Guernsey | St. Peter Port | 15 Jul 21 | |
| 131 | 42.37 | | | 41.05/40.9 | | Charlotte Buckley | U20 | -4 | David Wilkinson | Thames Valley | Wormwood Scrubs | 12 May 21 | |
| 132 | 42.40 | | | 42.40 | PB | Lucy Rebori | U17 | -7 | Stuart Kerr | Rotherham | Doncaster | 5 Sep 21 | |
| 132 | 42.40 | | | 41.81i | | Hazel Will | U17 | -8 | | Dundee Hawkhill | York | 5 Sep 21 | |
| 134 | 42.4 | | | 42.46/42.4 | PB | Nia Myers | U17 | -7 | Mark Goode | Notts | Nottingham | 12 Jun 21 | |
| 42.46 | | | | | | | | | | Nottingham | 12 Sep 21 | |
| 134 | 42.4 | | | 42.4 | PB | Jessica Howells | U15 | -9 | Andrew Fisher | Guildford & Godalming | Guildford | 7 Aug 21 | |
| 136 | 42.43 | | | 40.86 | | Faith Assah | U15 | -9 | | Cambridge H | Medway Park | 4 Sep 21 | |
| 137 | 42.44 | | | 42.12/42.1 | | Laura Anene | U17 | -6 | Daniel Hooker | Hillingdon | Harrow | 30 May 21 | |
| 137 | 42.44 | | | 40.04 | | Ophelia Jones | U15 | -10 | | Trafford | Hull | 15 Aug 21 | |
| 139 | 42.46 | | | 42.26/42.2 | | Gabriella Thoburn | U17 | -7 | Grant Brown | South London | Coulsdon | 1 May 21 | |
| 140 | 42.47 | | | 40.95 | | Teleri Jones | U17 | -6 | Barry Edwards | Menai | Stretford | 10 Apr 21 | |
| 141 | 42.50 | | | 42.24 | | Charlotte D'Arcy | U15 | -8 | Willy Russell | Banchory Stonehaven | Inverness | 25 Jul 21 | |
| 142 | 42.5 | | | 43.41/42.5 | PB | Megan Leigh | U17 | -8 | | Chorley ATC | Blackpool | 12 Jun 21 | |
| 43.41 | | | | | | | | | | Stretford | 25 May 21 | |
| 142 | 42.5 | | | 40.83 | | Jaya Collinson | U15 | -8 | Graeme Gourlay | Poole AC | Poole | 3 Jul 21 | |
| 42.63 | | | | | | | | | | Kingston | 22 Aug 21 | |
| 144 | 42.51 | | | 42.51 | PB | Rhiannon Dowinton | U20 | -4 | Nick Marley | Guernsey | St. Peter Port | 30 May 21 | |
| 145 | 42.52 | i | | 41.78 | | Nneka Okoh | U17 | -7 | Jade Harding | Chelmsford | Lee Valley | 5 Dec 21 | |
| 145 | 42.52 | i | | 40.74 | | Alexia Scotiniadis | U17 | -9 | Andy Poppleton | Tonbridge | Lee Valley | 12 Dec 21 | |
| 43.77 | | | | | | | | | | Ashford | 12 Jun 21 | |
| 147 | 42.54 | | | 42.54 | PB | Bea Oliver-Stevens | U17 | -6 | Lee Farleigh | Exeter | Plymouth | 1 Aug 21 | |
| 148 | 42.55 | | | 42.55 | PB | Manon Baines | U17 | -7 | Conrad Kalinowski | Shaftesbury Barnet | Harrow | 30 May 21 | |
| 148 | 42.55 | | | 42.04 | | Millie Bayman | U17 | -7 | | Salford H | Stretford | 30 May 21 | |
| 148 | 42.55 | | | 41.21i | | Seren Rodgers | U17 | -7 | Steve Shaw | Taunton | Exeter | 18 Jul 21 | |
| 151 | 42.57 | i | | 39.74i | | Isabella Davies | U15 | -10 | Michael Oluban | Birchfield H | Sportcity | 19 Dec 21 | |
| 152 | 42.58 | | | 42.58 | PB | Lily Stewart | U17 | -6 | | Tonbridge | Ashford | 9 May 21 | |
| 153 | 42.60 | | | 42.60 | PB | Oliwia Cwienczek | U17 | -7 | | Leeds City | Hull | 14 Aug 21 | |
| 153 | 42.60 | | | 42.60 | PB | Miriam Adebayo | U15 | -9 | Tony Benton | Havering | Hornchurch | 19 Sep 21 | |
| 155 | 42.6 | | | 43.31i/42.0 | | Olivia Allbut | U23 | -3 | Peter Irving | Shaftesbury Barnet | St. Clement | 27 May 21 | |
| 155 | 42.6 | | | 43.12/42.6 | PB | Holly Watson | U17 | -7 | Stephen Williams | Chelmsford | Chelmsford | 15 Aug 21 | |
| 155 | 42.6 | | | 42.04 | | Sadie Blake | U17 | -7 | Ann Hayter | City of Portsmouth | Portsmouth | 29 Aug 21 | |
| 155 | 42.6 | | | 43.21/42.6 | PB | Rosie Harris | U17 | -7 | | Charnwood | Nottingham | 5 Sep 21 | |
| 43.21 | | | | | | | | | | Leicester | 31 Jul 21 | |
| 159 | 42.61 | | | 42.61 | PB | Esme Pounder | U15 | -8 | Craig Pounder | City of York | York | 21 Aug 21 | |
| 160 | 42.62 | | | 42.62 | PB | Erin Rees | U17 | -8 | Nick Phipps | Windsor Slough Eton & Hounslow | Eton | 16 May 21 | |
| 161 | 42.65 | | | 42.65 | PB | Anna Rose | U17 | -8 | Ty Holden | Shaftesbury Barnet | Hendon | 15 Aug 21 | |
| 162 | 42.66 | i | | 40.73 | | Megan Webber | U23 | -3 | Darrell Maynard | Torbay | Cardiff | 19 Dec 21 | |
| 163 | 42.68 | | | 41.80 | | Ellie Mullins | U15 | -8 | | Marlborough Athletics | Sportcity | 11 Jul 21 | |
| 164 | 42.70 | | | 42.70 | PB | Lily Rees-Thomas | U17 | -7 | | Cardiff | Aberdare | 25 Jul 21 | |
| 165 | 42.7 | | | 42.72/42.7 | PB | Chloe Jardine | U17 | -6 | John Gates | Bexley | Woodford | 30 May 21 | |
| 165 | 42.7 | | | 39.11 | | Lily-Rose Brown | U15 | -10 | James McDonald | Herne Hill | Carshalton | 5 Jun 21 | |
| 43.35 | | | | | | | | | | Battersea Park | 4 Sep 21 | |
| 165 | 42.7 | | | 42.03 | | Julia Newman | U15 | -9 | Lorna Boothe | Sutton & District | Carshalton | 5 Jun 21 | |
| 42.74 | | | | | | | | | | Kingston | 1 Aug 21 | |
| 165 | 42.7 | | | 41.30i | | Queenivette Nguta | U15 | -9 | | Preston | Preston | 12 Sep 21 | |
| 169 | 42.71 | | | 42.71 | PB | Poppy Rowland-Hill | U15 | -9 | Darren Hatton | Thanet AC | Ashford | 9 May 21 | |
| 170 | 42.73 | | | 42.73 | PB | Isabelle Smith | U20 | -5 | Charlene Thomas | Harrogate | Sheffield | 3 May 21 | |
| 171 | 42.74 | | | 42.74 | PB | Larissa Wilson | U15 | -9 | | Newham & Essex Beagles | Lee Valley | 13 Jun 21 | |
| 171 | 42.74 | | | 42.74 | PB | Meabh Brannigan | U17 | -7 | | Kingston upon Hull | Grimsby | 22 Aug 21 | |
| 173 | 42.75 | | | 41.08/40.8 | | Mali Heard | U17 | -7 | Justin Jordan-Davis | City of Plymouth | Plymouth | 9 May 21 | |
| 173 | 42.75 | | | 42.28 | | Charlotte Harris | U17 | -8 | John Clarke | Barnet | Parliament Hill | 26 Jun 21 | |
| 175 | 42.77 | i | | 42.77i | PB | Jemma Thomson | U17 | -7 | Peter Griffiths | Chiltern | Lee Valley | 5 Dec 21 | |
| 43.25 | | | | | | | | | | Bracknell | 5 Sep 21 | |
| 175 | 42.77 | i | | 42.31 | | Bronwyn Mooney | U20 | -6 | Martin Bishell | Sheffield & Dearne | Sheffield | 11 Dec 21 | |
| 177 | 42.78 | i | | 40.60 | | Isabel Pinder | U20 | -5 | Ben Hazell | Basingstoke & Mid Hants | Lee Valley | 5 Dec 21 | |
| 178 | 42.79 | | | 41.90 | | Charis Duncan | U17 | -7 | | London Schs | Gillingham | 3 May 21 | |
| 179 | 42.80 | i | | 40.17 | | Sophie Osborn | U17 | -8 | Stuart Flack | Epsom & Ewell | Lee Valley | 5 Dec 21 | |
| 180 | 42.8 | | | 40.29i | | Catherine Reynolds | U20 | -6 | Martin Cook | Stratford-upon-Avon | Moulton | 8 May 21 | |
| 180 | 42.8 | | | 43.55/42.8 | PB | Catriona Scott | U17 | -6 | Moira Jordan | Victoria Park City of Glasgow | Scotstoun | 25 May 21 | |
| 180 | 42.8 | | | 43.14i/42.8 | PB | Hannah Pain | U17 | -7 | Denis Costello | City of Norwich | Norwich | 12 Jun 21 | |
| 43.14 | i | | | | | | | | | Lee Valley | 5 Dec 21 | |
| 180 | 42.8 | | | 45.15/42.8 | PB | Daisy Aspinall | U17 | -7 | Shaun Ainge | Cannock & Stafford | Stoke | 19 Jun 21 | |
| 180 | 42.8 | | | 44.52/42.8 | PB | Lola Urey | U15 | -8 | Peter Hancock | Preston | Bebington | 17 Jul 21 | |
| 180 | 42.8 | | | 41.40i | | Lilly Noble | U15 | -9 | | Deeside AAC | Wrexham | 17 Jul 21 | |
| 42.86 | | | | | | | | | | Cardiff | 15 Aug 21 | |
| 180 | 42.8 | | | 42.8 | PB | Lucci Baker | U17 | -7 | | Jersey | St. Clement | 19 Aug 21 | |
| 187 | 42.81 | | | 41.71 | | Ella Newman | U17 | -8 | Tim Richardson | Reading AC | Eton | 25 Jul 21 | |
| 187 | 42.81 | | | 42.81/42.2 | PB | Jasmine Pattison | U17 | -7 | Adrian Weston | Aldershot, Farnham & District | Kingston | 31 Jul 21 | |
| 189 | 42.84 | iA# | | 41.05i | | Dolita Awala-Shaw | U23 | -2 | Segrid Ayers | Newham & Essex Beagles | Provo UT, USA | 10 Dec 21 | |
| 190 | 42.85 | | | 42.85 | PB | Elizabeth McMahon | U23 | -2 | Martin Cook | West Cheshire | Loughborough | 19 May 21 | |
| 190 | 42.85 | | | 42.85 | PB | Zara Burns | U17 | -8 | Andrew Wood | Trafford | Stretford | 12 Jun 21 | |
| 190 | 42.85 | | | 42.85 | PB | Callie Jones | U15 | -9 | | Cwmbran | Newport | 26 Jun 21 | |
| 193 | 42.89 | | | 42.89 | PB | Sienna Kidd | U15 | -8 | John Shepherd | Newham & Essex Beagles | Mile End | 5 Jun 21 | |
| 194 | 42.90 | | | 42.90 | PB | Abigail Hutchby | U23 | -3 | Alan Hewson | Windsor Slough Eton & Hounslow | Loughborough | 16 Jun 21 | |
| 194 | 42.90 | | | 42.61 | | Erin Hughes | U20 | -5 | Steven Munday | Medway & Maidstone | Gillingham | 7 Aug 21 | |
| 196 | 42.9 | | | 44.15/42.9 | PB | Christabel Afriyie Amponsah | U17 | -7 | Mike Botha | Croydon | Carshalton | 28 Aug 21 | |
| 196 | 42.9 | | | 44.62i/42.9 | PB | Edith Avowlanu | U15 | -10 | Michael Utting | City of Norwich | Colchester | 12 Sep 21 | |
| 198 | 42.92 | | | 42.43 | | Olivia Sparks | U17 | -7 | Gary Telfer | Thames Valley | Wormwood Scrubs | 12 May 21 | |
| 199 | 42.97 | | | 42.97 | PB | Poppy Fox-Rowe | U17 | -7 | | Stratford-upon-Avon | Nuneaton | 19 Jun 21 | |
| 199 | 42.97 | | | 42.97 | PB | Imogen Bond | U17 | -8 | Neil Parsley | Exeter | Plymouth | 1 Aug 21 | |
| 199 | 42.97 | | | 42.66/42.2 | | Leoni Pye | U17 | -7 | | Middlesbrough (Mandale) | Middlesbrough | 22 Aug 21 | |
| 199 | 42.97 | | | 42.36i | | Keziah Olaleye | U15 | -8 | Mick Bond | Cambridge H | Medway Park | 4 Sep 21 | |
| 203 | 42.98 | | | 42.98 | PB | Gabriella Martin | U17 | -8 | Andy Frankish | Blackheath & Bromley | Tonbridge | 30 Aug 21 | |
| 204 | 43.0 | | | 44.06/43.0 | PB | Sara Clough | U15 | -9 | Peter Shaw | Sale Harriers Manchester | Sportcity | 5 Jun 21 | |
| 204 | 43.0 | | | 41.33 | | Elizabeth Fox-Payne | U15 | -9 | | Royal Sutton Coldfield | Stourport | 3 Jul 21 | |
| 43.61 | | | | | | | | | | Coventry | 4 Sep 21 | |
| 204 | 43.0 | | | 44.25/43.0 | PB | Lauren Williams | U17 | -7 | | West Cheshire | Bebington | 25 Jul 21 | |
| 207 | 43.01 | i | | 40.71 | | Chloe Farmer | U15 | -9 | Lisa Waddon | Cardiff Archers | Cardiff | 5 Dec 21 | |
| 43.72 | | | | | | | | | | Newport | 4 Sep 21 | |
| 43.9 | | | | | | | | | | Hereford | 17 Jul 21 | |
| 208 | 43.03 | | | 41.55/41.5 | | Ella Fryer | U20 | -6 | Michael Rimmer | St. Mary's Richmond | Worthing | 18 Apr 21 | |
| 208 | 43.03 | | | 40.65 | | Lucy Salter | U15 | -8 | | Crewe & Nantwich | Stretford | 31 May 21 | |
| 208 | 43.03 | | | 43.03 | PB | Neve Davenport | U17 | -7 | Andrew Wood | Trafford | Hull | 14 Aug 21 | |
| 208 | 43.03 | i | | 42.19 | | Lauren Butler | U23 | -2 | Martin Owens | Birchfield H | Sportcity | 5 Dec 21 | |
| 212 | 43.05 | | | 43.05 | PB | Sophie Ajuka | U17 | -7 | Lorna Boothe | Sutton & District | Coulsdon | 1 May 21 | |
| 212 | 43.05 | | | 43.05 | PB | Lilah Unwin | U15 | -8 | David Mills | Reigate Priory | Guildford | 17 Jul 21 | |
| 212 | 43.05 | i | | 41.39i | | Eva Tyler | U17 | -7 | Matt Elias | Hereford | Cardiff | 19 Dec 21 | |
| 43.2 | | | | | | | | | | Hereford | 5 Sep 21 | |
| 43.64 | | | | | | | | | | Yate | 25 Jul 21 | |
| 215 | 43.06 | | | 40.95i | | MIllie Webb | U17 | -8 | Connor Lane | Cardiff | Aberdare | 25 Jul 21 | |
| 216 | 43.07 | | | 43.07 | PB | Natalie Cloy | U17 | -7 | Robert Wright | Dacorum | Lee Valley | 25 Apr 21 | |
| 216 | 43.07 | | | 42.08 | | Abi Coltherd | U15 | -9 | | Orkney | Aberdeen | 28 Aug 21 | |
| 218 | 43.08 | | | 43.08 | PB | Isla Brown | U17 | -7 | Alan Hewson | Windsor Slough Eton & Hounslow | Milton Keynes | 31 Jul 21 | |
| 219 | 43.10 | | | 42.61 | | Grace Wright | U17 | -8 | Darren Lewis | Tipton | Nuneaton | 18 Apr 21 | |
| 220 | 43.1 | | | 42.10 | | Isabella Merritt | U17 | -7 | Trevor Williams | Horwich | Sportcity | 25 Jul 21 | |
| 43.77 | | | | | | | | | | Stretford | 9 May 21 | |
| 221 | 43.11 | i | | 43.11i | PB | Arabella Lamb | U17 | -8 | | Atletismo Mijas | Antequera, ESP | 14 Mar 21 | |
| 43.38 | | | | | | | | | | Málaga (C), ESP | 16 Jan 21 | |
| 221 | 43.11 | | | 43.11 | PB | Brogan McCafferty | U17 | -6 | Lesley Pearson | Windsor Slough Eton & Hounslow | Eton | 16 May 21 | |
| 221 | 43.11 | | | 43.11 | PB | Abbie Harrison | U17 | -7 | | Inverness | Inverness | 25 Jul 21 | |
| 224 | 43.12 | | | 43.12 | PB | Freya Blundell | U15 | -8 | | Wimborne | Swindon | 18 Jul 21 | |
| 224 | 43.12 | i | | 42.35i | | Lydia Morris | U20 | -5 | Martin Bullock | Manx | Sportcity | 5 Dec 21 | |
| 226 | 43.13 | | | 42.53 | | Olivia Harper | U17 | -8 | | Gateshead | York | 30 May 21 | |
| 226 | 43.13 | | | 42.63/42.4 | | Arantxa Middleton | U17 | -7 | Gordon Densley | Tamworth | Nuneaton | 22 Aug 21 | |
| 228 | 43.14 | | | 41.26 | | Chanelle Cole | U20 | -4 | Roy Dickens | Blackheath & Bromley | Bromley | 24 May 21 | |
| 228 | 43.14 | i | | 43.14i | PB | Susan Folorunso | U20 | -6 | | Gateshead | Sheffield | 11 Dec 21 | |
| 230 | 43.15 | | | 40.93 | | Mia Oldfield | U17 | -7 | David Wilkinson | Thames Valley | Wormwood Scrubs | 12 May 21 | |
| 230 | 43.15 | | | 43.15 | PB | Daisy Kaye | U15 | -8 | Joe McColgan | Amber Valley & Erewash | Loughborough | 16 Jun 21 | |
| 232 | 43.16 | | | 43.16 | PB | Katie Grafton | U17 | -6 | Wendy Andrews | East Cheshire | Stretford | 5 Sep 21 | |
| 233 | 43.17 | | | 41.48 | | Nia Harradine-Cole | U15 | -10 | Jason Yeo | Newton Abbot | Horspath | 11 Sep 21 | |
| 234 | 43.19 | i | | 42.08i | | Olivia Gillespie | U17 | -8 | Kevin Williams | Newport H | Cardiff | 5 Dec 21 | |
| 43.8 | | | | | | | | | | Cheltenham | 29 May 21 | |
| 234 | 43.19 | i | | 42.30i | | Jessica Waters | U23 | -2 | | Sutton-in-Ashfield | Sheffield | 11 Dec 21 | |
| 236 | 43.20 | | | 42.95/42.9 | | Zena Challenger | U23 | -3 | John Skevington | Wreake & Soar Valley | Loughborough | 16 Jun 21 | |
| 236 | 43.20 | | | 43.20 | PB | Gaby Bilbie | U15 | -8 | Richard Nation | Chelmsford | Dagenham | 24 Jul 21 | |
| 236 | 43.20 | | | 43.20 | PB | Izzy Turner | U15 | -9 | | St. Mary's Richmond | Battersea Park | 4 Sep 21 | |
| 239 | 43.2 | | | 46.09/43.2 | PB | Bailey O'Leary | U17 | -8 | Anne Hegvold | Hercules Wimbledon | Kingston | 26 Jun 21 | |
| 239 | 43.2 | | | 43.2 | PB | Isabelle Rushmere | U15 | -8 | | Great Yarmouth | Norwich | 29 Aug 21 | |
| 239 | 43.2 | | | 40.33 | | Emily Bowker | U15 | -9 | | East Cheshire | Ashton-under-Lyne | 4 Sep 21 | |
| 43.32 | | | | | | | | | | Stretford | 21 Aug 21 | |
| 239 | 43.2 | | | 41.47 | | Ines Green | U17 | -7 | | Ipswich | Colchester | 12 Sep 21 | |
| 243 | 43.22 | | | 42.97 | | Amelie McGurk | U17 | -8 | David Churcher | Chichester | Portsmouth | 25 Sep 21 | |
| 244 | 43.24 | | | 41.80 | | Isabelle Kyson | U15 | -10 | Christine Harrison-Bloomfield | Woodford Green Essex Ladies | Hornchurch | 2 May 21 | |
| 245 | 43.25 | | | 43.25 | PB | Ruby Green | U17 | -7 | | Bedford & County | Stevenage | 15 Aug 21 | |
| 245 | 43.25 | i | | 41.33 | | Isla Innes | U20 | -4 | | Edinburgh AC | Sheffield | 11 Dec 21 | |
| 247 | 43.27 | | | 42.81i | | Emma Ibbotson | U17 | -6 | Charlene Thomas | Harrogate | Sheffield | 3 May 21 | |
| 248 | 43.29 | | | 43.29 | PB | Georgia Smele | U15 | -9 | Jeff Roberts | Bridgend | Aberdare | 17 Jul 21 | |
| 249 | 43.30 | | | 43.05 | | Seren Redfern | U15 | -8 | | Stockport T&F | Stretford | 31 May 21 | |
| 249 | 43.30 | i | | 42.19i | | Hannah Mcdermott | U15 | -9 | | Victoria Park City of Glasgow | Emirates Arena | 12 Dec 21 | |
| 251 | 43.31 | | | 43.23/43.2 | | Emily Richardson | U15 | -9 | | Barnsley AC | Sheffield | 9 Jun 21 | |
| 252 | 43.32 | i | | 41.91 | | Rebecca Roots | U23 | -1 | Dave Lease | Torbay | Cardiff | 19 Dec 21 | |
| 253 | 43.33 | | | 42.68i | | Dina Silverman | U15 | -10 | Ty Holden | Shaftesbury Barnet | Hendon | 31 Jul 21 | |
| 253 | 43.33 | | | 43.33 | PB | Amber Wade | U15 | -8 | Duncan Robertson | Giffnock North | Dunfermline | 21 Aug 21 | |
| 255 | 43.34 | | | 43.34/43.3 | PB | Annabelle Hess | U17 | -7 | Tammie Ryder | Tavistock | Exeter | 12 Jun 21 | |
| 255 | 43.34 | | | 43.34 | PB | Lucy Moynihan | U15 | -8 | | | Aberdeen | 28 Aug 21 | |
| 257 | 43.35 | | | 40.54 | | Holly Ovens | U15 | -9 | Steven Doig | Fife | Grangemouth | 14 Aug 21 | |
| 258 | 43.38 | | | 43.15i | | Gemima Eshimu Massamba | U23 | -2 | | Ilford | Dagenham | 25 Apr 21 | |
| 258 | 43.38 | | | 43.38 | PB | Kezia Beeton | U17 | -8 | John Stow | Woodford Green Essex Ladies | Lee Valley | 25 Apr 21 | |
| 258 | 43.38 | | | 43.13 | | Carly Smith | U17 | -8 | | Livingston | Livingston | 19 Sep 21 | |
| 261 | 43.39 | | | 43.21 | | Lily Simon | U15 | -9 | | Pitreavie | Scotstoun | 7 Jul 21 | |
| 261 | 43.39 | | | 43.08 | | Mia Belton | U17 | -7 | | Morpeth | Middlesbrough | 22 Aug 21 | |
| 261 | 43.39 | i | | 43.14 | | Jessica Lake | U20 | -4 | Stefan Wilcockson | Mansfield | Sheffield | 11 Dec 21 | |
| 264 | 43.40 | | | 42.46i | | Keira Devereux | U17 | -8 | Julian Emery | North Somerset | Yeovil | 21 Aug 21 | |
| 264 | 43.40 | | | 42.07/42.0 | | Florry Siderfin | U15 | -8 | | New Forest Junior | Portsmouth | 25 Sep 21 | |
| 266 | 43.4 | | | 43.22 | | Lilia Mico | U15 | -9 | Geoff Aston | Worcester | Stourport | 3 Jul 21 | |
| 266 | 43.4 | | | 43.67/43.4 | PB | Katelyn Howden | U17 | -7 | | Cleethorpes | Grimsby | 18 Jul 21 | |
| 266 | 43.4 | | | 41.41 | | Sienna Shipton | U15 | -10 | David Fewell | Chelmsford | Chelmsford | 15 Aug 21 | |
| 269 | 43.41 | | | 43.41 | PB | Elise Horner | U17 | -7 | | Halifax | Cleckheaton | 12 Sep 21 | |
| 270 | 43.45 | | | 40.82 | | Lauren Abbott | U15 | -9 | Scott Hamilton | Elgin | Aberdeen | 28 Aug 21 | |
| 271 | 43.48 | | -2.6 | 43.48 | PB | Stroma Fraser | U17 | -7 | Charles Bannerman | Inverness | Inverness | 6 Jun 21 | |
| 271 | 43.48 | | | 43.48 | PB | Sophie Long | U15 | -8 | | Surrey Schs | Kingston | 12 Jun 21 | |
| 271 | 43.48 | | | 41.34 | | Teniola Fajuke | U17 | -6 | Alf Vickers | Victoria Park & Tower Hamlets | Basildon | 5 Sep 21 | |
| 274 | 43.49 | | | 43.49 | PB | Elin Roberts | U15 | -9 | Andrew Fisher | Guildford & Godalming | Kingston | 1 Aug 21 | |
| 275 | 43.5 | | | 40.86 | | Menna Pugsley | U15 | -10 | | Oswestry | Moulton | 12 Jun 21 | |
| 43.91 | | | | | | | | | | Stretford | 15 May 21 | |
| 275 | 43.5 | | | 43.15 | | Lottie McLaren | U17 | -8 | Matthew Hargreaves | Tamworth | Stoke | 19 Jun 21 | |
| 275 | 43.5 | | | 44.00/43.5 | PB | Lara Turner | U15 | -9 | Shane Smith | Kettering | Corby | 3 Jul 21 | |
| 275 | 43.5 | | | 44.40i/43.5 | PB | Hannah Hope | U17 | -7 | | Liverpool H | Bebington | 25 Jul 21 | |
| 275 | 43.5 | | | 42.50/42.4 | | Ruth Westland | U17 | -8 | | Ipswich | Norwich | 29 Aug 21 | |
| 275 | 43.5 | | | 42.74 | | Izzy Fox | U15 | -9 | | Reading AC | Bracknell | 4 Sep 21 | |
| 43.99 | | | | | | | | | | Eton | 31 Jul 21 | |
| 281 | 43.51 | i | | 43.51i/43.2 | PB | Dijana Clarke | U23 | -3 | | Worcester | Sheffield | 11 Dec 21 | |
| 282 | 43.53 | | | 43.53 | PB | Katie-Marie Sherlock | U20 | -6 | Lumar Sylvester | Thames Valley | Harrow | 30 May 21 | |
| 283 | 43.54 | | | 43.33/43.2 | | Alex Spurway | U17 | -6 | | Leamington Athletics Academy | Nuneaton | 4 Jul 21 | |
| 283 | 43.54 | i | | 43.54i/43.4 | PB | Farrah Cook | U23 | -2 | | Wreake & Soar Valley | Sheffield | 11 Dec 21 | |
| 285 | 43.56 | | | 43.17/42.5 | | Orla Edwards | U17 | -7 | Richard Edwards | Crawley | Crawley | 12 Jun 21 | |
| 285 | 43.56 | i | | 43.56i/42.9 | PB | Kati Hulme | U20 | -4 | Mike Bennett | Shrewsbury | Cardiff | 1 Dec 21 | |
| 285 | 43.56 | i | | 41.60i | | Abigail Bishell | | 4 | John Baron | Sheffield & Dearne | Sheffield | 11 Dec 21 | |
| 288 | 43.57 | | | 42.20 | | Darcey Hodgson | U15 | -9 | Nick Marley | Guernsey | St. Peter Port | 1 Jul 21 | |
| 289 | 43.58 | | | 43.58 | PB | Hannah Moody | U17 | -6 | | Chesterfield | Doncaster | 5 Sep 21 | |
| 290 | 43.59 | | | 43.59 | PB | Zoe Thomas | U17 | -8 | | City of Salisbury | Yeovil | 1 May 21 | |
| 291 | 43.60 | | | 42.94/42.8 | | Emily Dunkley | U17 | -6 | Claire East | City of Portsmouth | Southampton | 16 May 21 | |
| 291 | 43.60 | | -1.6 | 42.99i | | Nia Parry | U15 | -9 | | Newport H | Newport | 12 Jun 21 | |
| 293 | 43.6 | | | 45.14/43.6 | PB | Abigail Dresser | U15 | -8 | | Heaton | Gateshead | 19 Jun 21 | |
| 293 | 43.6 | | | 45.62/43.6 | PB | Olivia Clarke | U17 | -8 | | Shrewsbury | Telford | 19 Jun 21 | |
| 293 | 43.6 | | | 41.01 | | Bonheur Tshibola | U15 | -8 | Gordon Ainsley | BRAT | Stourport | 3 Jul 21 | |
| 293 | 43.6 | | | 43.18i | | Abigail Hackley | U15 | -9 | | Hillingdon | Ware | 17 Jul 21 | |
| 293 | 43.6 | | | 41.9 | | Ava Lloyd | U17 | -7 | Trevor Painter | Wigan & District | Sportcity | 25 Jul 21 | |
| 293 | 43.6 | | | 46.06/43.6 | PB | Jayne Elvin | U17 | -7 | Kelvin Stone | Thurrock | Chelmsford | 15 Aug 21 | |
| 293 | 43.6 | | | 40.52/40.1 | | Ava Freeman | U15 | -9 | Richard Eastman | Kidderminster & Stourport | Solihull | 4 Sep 21 | |
| 300 | 43.63 | | | 43.63 | PB | Siofra Lavery | U15 | -8 | Barrington Morris | City of Lisburn | Antrim | 4 Jul 21 | |
| 300 | 43.63 | | | 40.33 | | Eleanor McIntosh | U15 | -8 | Nick Harris | Bristol & West | Yeovil | 18 Sep 21 | |
| 302 | 43.64 | | -2.6 | 43.64 | PB | Tiwaah Boateng | U17 | -8 | Mark Roche | Newport H | Newport | 12 Jun 21 | |
| 302 | 43.64 | | | 43.64 | PB | Holly Jessop | U17 | -8 | Andrew Mihranian | Stockport | Stretford | 6 Jul 21 | |
| 304 | 43.65 | | | 43.65 | PB | Immy Hales | U23 | -3 | | Bristol & West | Loughborough | 16 Jun 21 | |
| 305 | 43.66 | | | 42.61 | | Katarina Savkovic | U15 | -9 | | City of York | Hull | 15 Aug 21 | |
| 306 | 43.67 | | | 43.67 | PB | Maya Kara | U20 | -6 | | Windsor Slough Eton & Hounslow | Eton | 16 May 21 | |
| 306 | 43.67 | | | 43.67/42.7 | PB | Charlotte Prince | U17 | -8 | Chrissie Prince | Royal Sutton Coldfield | Nuneaton | 1 Aug 21 | |
| 306 | 43.67 | | | 43.67 | PB | Gracie Gray-Giles | U17 | -7 | | Aberdeen | Grangemouth | 15 Aug 21 | |
| 309 | 43.68 | | | 40.81 | | Alyssa Firla | U15 | -9 | Roy Dickens | Blackheath & Bromley | Tonbridge | 30 Aug 21 | |
| 310 | 43.69 | | | 43.69/42.9 | PB | Sonya Chechik | U17 | -8 | Craig Pounder | City of York | Sheffield | 9 Jun 21 | |
| 310 | 43.69 | | | 43.69 | PB | Jessica Lewis | U17 | -7 | Darrell Smith | Sevenoaks | Ashford | 12 Jun 21 | |
| 310 | 43.69 | | | 43.69 | PB | Ellen McMurdo | U17 | -7 | William MacRury | Stornoway | Inverness | 13 Jun 21 | |
| 313 | 43.7 | | | 41.79 | | Abigail Phillips | U17 | -7 | Zac Kerin | Bournemouth | Poole | 12 Jun 21 | |
| 313 | 43.7 | | | 40.97 | | Sadie Parker | U15 | -10 | Daniel Njai-Rowney | Blyth | Gateshead | 19 Jun 21 | |
| 313 | 43.7 | | | 44.41/43.7 | PB | Maisie Scamp | U17 | -7 | | BRAT | Sutton Coldfield | 19 Jun 21 | |
| 313 | 43.7 | | | 45.29/43.7 | PB | Ruby Ibbotson | U17 | -7 | | Taunton | Yeovil | 4 Jul 21 | |
| 313 | 43.7 | | | 47.36/43.7 | PB | Jenny Critchley | U17 | -8 | | Bicester | Horspath | 5 Sep 21 | |
| 318 | 43.71 | | | 40.48i | | Kyra White | U23 | -1 | Darren Braithwaite | Enfield & Haringey | Bromley | 24 May 21 | |
| 319 | 43.73 | | | 41.00 | | Lucy Wright | U15 | -9 | James McDonald | Herne Hill | Battersea Park | 4 Sep 21 | |
| 320 | 43.76 | | | 43.68i | | Tallulah Ndikanwu | U15 | -8 | Jay Galley | Blackheath & Bromley | Ashford | 9 May 21 | |
| 321 | 43.77 | i | | 43.77i | PB | Grace Forster | U20 | -6 | Peter Gore | City of Norwich | Lee Valley | 5 Dec 21 | |
| 322 | 43.78 | i | | 43.78i | PB | Precious Asemota | U17 | -8 | | BFT Track Academy | Lee Valley | 12 Dec 21 | |
| 323 | 43.79 | | | 41.20 | | Rosie Kornevall | U15 | -8 | David Leach | Lewes | Brighton | 4 Jul 21 | |
| 324 | 43.8 | | | 42.47 | | Erin MacFarlane | U17 | -7 | Steven Doig | Pitreavie | Dunfermline | 9 May 21 | |
| 324 | 43.8 | | | 43.75i | | Katie Thomson | U15 | -9 | | Pitreavie | Dunfermline | 9 May 21 | |
| 43.95 | | | | | | | | | | Grangemouth | 1 Aug 21 | |
| 324 | 43.8 | | | 43.95/43.6 | | Lottie Bentley | U17 | -7 | Mike Bennett | Worcester | Cheltenham | 29 May 21 | |
| 324 | 43.8 | | | 42.12 | | Nieve Robinson | U17 | -8 | Margaret Galvin | Leigh | Leigh | 30 May 21 | |
| 324 | 43.8 | | | 43.65 | | Alisha Carroll | U15 | -8 | Stephen Carroll | Liverpool H | Ellesmere Port | 5 Jun 21 | |
| 324 | 43.8 | | | 44.19/43.8 | PB | Jemima Byers | U17 | -7 | | Dacorum | Hemel Hempstead | 12 Jun 21 | |
| 324 | 43.8 | | | 43.8 | PB | Mayalee Osola | U17 | -7 | | Bristol & West | Yate | 13 Jun 21 | |
| 324 | 43.8 | | | 43.60 | | Lucy Milburn | U15 | -9 | | | Gateshead | 19 Jun 21 | |
| 324 | 43.8 | | | 45.61/43.8 | PB | Alice Tyler | U17 | -7 | | Burton | Stoke | 19 Jun 21 | |
| 324 | 43.8 | | | 44.23/43.8 | PB | Emma Shedden | U17 | -7 | | Winchester | Portsmouth | 29 Aug 21 | |
| 324 | 43.8 | | | 43.8 | PB | Lucy Mitchell | U15 | -9 | | Southport Waterloo | Liverpool | 4 Sep 21 | |
| 335 | 43.82 | | | 39.96 | | Tami Adesina | U15 | -10 | David Hourd | Notts | Nottingham | 11 Sep 21 | |
| 335 | 43.82 | i | | 42.67i | | Michelle Owusu | U20 | -4 | Howard Court | Birchfield H | Sheffield | 11 Dec 21 | |
| 337 | 43.83 | | | 42.88 | | Lola McCann-Ezekiel | U17 | -8 | Ty Holden | Shaftesbury Barnet | Dagenham | 29 May 21 | |
| 338 | 43.86 | | | 43.86 | PB | Kiera Whittingham | U15 | -9 | | Inverness | Aberdeen | 28 Aug 21 | |
| 339 | 43.88 | | | 42.91 | | Mia Liddell | U20 | -5 | Philip Gardiner | Gateshead | Jarrow | 28 Apr 21 | |
| 339 | 43.88 | | | 43.39 | | Isabelle Allenby | U15 | -8 | | Cleethorpes | Grimsby | 22 Aug 21 | |
| 341 | 43.89 | | | 43.16/42.7 | | Evie Turner | U17 | -7 | Graham Howell | Westbury | Yate | 25 Jul 21 | |
| 342 | 43.9 | | | 43.9 | PB | Abigail McAndrew | U17 | -7 | Edmund Finucane | Blackburn | Lancaster | 30 May 21 | |
| 342 | 43.9 | | | 43.9 | PB | Ryley Malone-Priest | U17 | -7 | | Halesowen | Stourport | 30 May 21 | |
| 342 | 43.9 | | | 44.34/43.9 | PB | Bethany Cooper | U15 | -8 | Haydn Morris | Poole Runners | Poole | 12 Jun 21 | |
| 342 | 43.9 | | | 43.94/43.9 | PB | Lucy Webster | U17 | -7 | Karen Storey | Gateshead | Gateshead | 19 Jun 21 | |
| 43.94 | | | | | | | | | | Middlesbrough | 22 Aug 21 | |
| 342 | 43.9 | | | 42.42 | | Lexi Wilkinson | U17 | -8 | Bill Boyd | Corby | Corby | 1 Aug 21 | |
| 342 | 43.9 | | | 43.01/42.7 | | Mia Conduit | U15 | -8 | Robert Pinton | Solihull & Small Heath | Solihull | 4 Sep 21 | |
| 342 | 43.9 | | | 44.11/43.9 | PB | Michelle Yalekhue | U17 | -7 | | Notts | Nottingham | 5 Sep 21 | |
| 349 | 43.93 | | | 43.93 | PB | Maya Sutaria | U15 | -9 | David Wilkinson | Thames Valley | Wormwood Scrubs | 5 Jun 21 | |
| 349 | 43.93 | | | 43.93 | PB | Darcy Breen | U17 | -8 | | Stockport | Stretford | 6 Jul 21 | |
| 349 | 43.93 | | | 43.93 | PB | Jenna Humphreys | U15 | -9 | | Invicta East Kent | Canterbury | 29 Aug 21 | |
| 352 | 43.94 | | | 39.87 | | Olivia Bell | U17 | -8 | Richard Harris | Rotherham | Doncaster | 5 Sep 21 | |
| 353 | 43.95 | | | 43.36/42.5 | | Faith Mpassy | U17 | -8 | Jay Galley | Blackheath & Bromley | Ashford | 12 Jun 21 | |
| 354 | 43.96 | | | 43.86/43.2 | | Maia Thompson | U15 | -9 | James Wright | Rugby & Northampton | Loughborough | 16 Jun 21 | |
| 355 | 43.97 | i | | 43.75 | | Emily Happell | U20 | -7 | Lesley Anne Allen | Ayr Seaforth | Sportcity | 5 Dec 21 | |
| 355 | 43.97 | i | | 40.63 | | Chloe Esegbona | | 1 | Stephen Ball | Trafford | Sportcity | 19 Dec 21 | |
| 357 | 43.99 | | | 43.00 | | Tabitha Proudley | U20 | -6 | Katy Odell | Southampton | Worthing | 18 Apr 21 | |
| 358 | 44.00 | | | 44.00 | PB | Ella Isaias | U17 | -6 | David Bee | City of Plymouth | Exeter | 12 Jun 21 | |
| 358 | 44.00 | | | 44.00 | PB | Amelie Carpentier | U17 | -8 | Tom Druce | Guernsey | St. Peter Port | 1 Jul 21 | |
| 358 | 44.00 | | | 43.51 | | Beth Davidse | U17 | -7 | John Dill | Swindon | Swindon | 18 Jul 21 | |
| 361 | 44.0 | | | 42.96 | | Isabelle Burlington | U17 | -7 | | Mansfield | Leicester | 30 May 21 | |
| 361 | 44.0 | | | 44.64/44.0 | PB | Lilly Jones | U17 | -7 | Rachel Jones | New Forest Junior | Salisbury | 13 Jun 21 | |
| 361 | 44.0 | | | 44.53/44.0 | PB | Katie Savage | U17 | -8 | | Herts Phoenix | Sandy | 16 Jun 21 | |
| 361 | 44.0 | | | 43.60 | | Melissa McCusker | U17 | -8 | | Wells City | Yeovil | 4 Jul 21 | |
| 361 | 44.0 | | | 44.33/44.0 | PB | Imogen Carew | U15 | -9 | | Wirral | Bebington | 17 Jul 21 | |
| 361 | 44.0 | | | 43.90i | | Olivia Morgan | U17 | -7 | Michael Dandy | Southport Waterloo | Bebington | 25 Jul 21 | |
| 361 | 44.0 | | | 42.57i | | Charlotte Williams | U17 | -6 | | Epsom & Ewell | Guildford | 7 Aug 21 | |
| 38.63 | | | 38.63 | PB | Linnea Killander | | 6 | | Thames Valley | Lisbon, POR | 25 Apr 21 | |
| 40.24 | | | 40.24 | PB | Anna Becker | U17 | -7 | | Somerset Schs | Sportcity | 10 Jul 21 | |
| 41.95 | i | | 41.95i | PB | Claudia Andre | U23 | -2 | TJ Ossai | BFT Track Academy | Lee Valley | 12 Dec 21 | |
| 42.4 | | | 42.4 | PB | Rana Zaghloul | U23 | -3 | | Loughborough Students | Corby | 8 Jun 21 | |
| 42.44 | | | 41.61 | | Veronica O'Neill | U17 | -8 | | City of Derry | Belfast | 24 Jul 21 | |
| 42.85 | | | 40.91 | | Vanessa Ansuaa | U20 | -5 | Craig Andrew | Shaftesbury Barnet | Dagenham | 25 Apr 21 | |
| 43.38 | | | 43.38 | PB | Brynja Brynjarsdottir | U17 | -7 | Wendy Phillips | City of Lisburn | Antrim | 4 Jul 21 | |