(1) | 44.28 | | Croydon Harriers | | 1 FINAL | Carshalton | 3 September 2023 |
(2) | 45.31 | CBP | Hercules Wimbledon AC | | 1 FINAL | Carshalton | 12 September 2021 |
(3) | 45.37 | CBP | Hercules Wimbledon AC 'A' | (Hercules Wimbledon AC) | 1 FINAL | Carshalton | 8 September 2019 |
(4) | 45.8 | CBP | Belgrave Harriers 'A' | | 1 FINAL | Stompond Lane, Walton | 19 September 1993 |
(5) | 46.10 | | Hercules Wimbledon AC 'A' | | 1 FINAL | Carshalton | 4 September 2022 |
| 46.10 | | Hercules Wimbledon AC 'A' | | 1 HEAT 1 | Carshalton | 4 September 2022 |
(7) | 46.18 | | Woking AC | | 2 HEAT 1 | Carshalton | 4 September 2022 |
(8) | 46.31 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 9 September 2018 |
(9) | 46.53 | | Belgrave Harriers | | 1 FINAL | Carshalton | 13 September 2015 |
(10) | 46.65 | | Hercules Wimbledon AC 'A' | | 1 FINAL | Carshalton | 11 September 2016 |
(11) | 46.7 | | Croydon Harriers 'A' | | 2 FINAL | Stompond Lane, Walton | 19 September 1993 |
(12) | 46.71 | | Sutton & District AC 'A' | | 1 HEAT 2 | Carshalton | 4 September 2022 |
(13) | 46.91 | | Sutton & District AC 'A' | | 2 FINAL | Carshalton | 4 September 2022 |
(14) | 46.92 | | Belgrave Harriers | | 2 FINAL | Carshalton | 11 September 2016 |
(15) | 47.26 | | Epsom & Ewell H | | 3 FINAL | Carshalton | 4 September 2022 |
(16) | 47.27 | | Woking AC | (Woking AC) | 2 FINAL | Carshalton | 8 September 2019 |
(17) | 47.43 | | Woking AC | | 2 FINAL | Carshalton | 3 September 2023 |
(18) | 47.44 | | Woking AC | | 2 FINAL | Carshalton | 9 September 2018 |
| 47.44 | | Herne Hill Harriers | (Herne Hill Harriers) | 3 FINAL | Carshalton | 8 September 2019 |
(20) | 47.5 | | Hercules Wimbledon AC | | 1 FINAL | Kingsmeadow Stadium | 22 September 1991 |
| 47.5 | | Belgrave Harriers 'A' | | 1 HEAT 1 | Kingsmeadow Stadium | 13 September 1992 |
| 47.50 | | Epsom & Ewell H | | 3 HEAT 1 | Carshalton | 4 September 2022 |
(23) | 47.6 | | Hercules Wimbledon AC | | 2 HEAT 1 | Kingsmeadow Stadium | 13 September 1992 |
(24) | 47.7 | | Herne Hill Harriers | | 3 FINAL | Stompond Lane, Walton | 19 September 1993 |
(25) | 47.86 | | Epsom & Ewell Harriers | | 2 FINAL | Carshalton | 12 September 2021 |
(26) | 47.97 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 10 September 2017 |
(27) | 48.23 | | Herne Hill Harriers | | 1 FINAL | Sutton Arena | 8 September 2013 |
(28) | 48.3 | | Hercules Wimbledon AC | | 1 FINAL | Kingsmeadow Stadium | 13 September 1992 |
(29) | 48.31 | | Herne Hill Harriers 'A' | | 3 FINAL | Carshalton | 12 September 2021 |
(30) | 48.37 | | Kingston AC & Polytechnic H 'A' | | 2 FINAL | Carshalton | 10 September 2017 |
(31) | 48.38 | | Sutton & District AC 'A' | | 4 FINAL | Carshalton | 12 September 2021 |
(32) | 48.4 | | Croydon Harriers | | 1 FINAL | Tooting Bec | 26 April 1986 |
(33) | 48.5y | | | (Spencer Park School, Wandsworth) | 1 FINAL | Wimbledon Park | 26 May 1962 |
| 48.5 | | Camberley & District AC | | 1 FINAL | Sheerwater, Woking | 23 April 1989 |
| 48.5 | | Croydon Harriers 'A' | | 1 FINAL | Croydon Arena | 14 May 1995 |
| 48.50 | | Sutton & District AC | | 3 FINAL | Carshalton | 9 September 2018 |
(37) | 48.53 | | Sutton & District AC 'B' | | 4 HEAT 1 | Carshalton | 4 September 2022 |
(38) | 48.6y | | | (De Burgh School, Tadworth) | 2 FINAL | Wimbledon Park | 26 May 1962 |
| 48.6 | | Camberley & District AC | | 1 HEAT 1 | Sheerwater, Woking | 23 April 1989 |
(40) | 48.63 | | Herne Hill Harriers | | 1 FINAL | Sutton Arena | 9 September 2012 |
(41) | 48.70 | | Epsom & Ewell Harriers | (Epsom & Ewell Harriers) | 4 FINAL | Carshalton | 8 September 2019 |
(42) | 48.8 | | St Joseph's College, Upper Norwood | (St Josephs's College, Upper Norwood) | 1 FINAL | Crystal Palace | 23 July 1968 |
(43) | 48.84 | | Sutton & District AC 'B' | | 4 FINAL | Carshalton | 4 September 2022 |
(44) | 48.9 | | Belgrave Harriers 'B' | | 4 FINAL | Stompond Lane, Walton | 19 September 1993 |
(45) | 49.0 | | Tulse Hill High School | (Tulse Hill School) | 2 FINAL | Crystal Palace | 23 July 1968 |
| 49.0 | | Belgrave Harriers | | 1 FINAL | Croydon Arena | 23 April 1983 |
(47) | 49.04 | | Herne Hill H 'B' | | 5 FINAL | Carshalton | 4 September 2022 |
(48) | 49.1 | | Surrey AC | | 1 FINAL | Motspur Park | 25 April 1981 |
| 49.1 | | Belgrave Harriers | | 1 HEAT 1 | Croydon Arena | 23 April 1983 |
| 49.1 | | Croydon Harriers | | 2 FINAL | Croydon Arena | 23 April 1983 |
| 49.1 | | Herne Hill Harriers 'A' | | 1 FINAL | Sutton Arena | 11 September 1994 |
(52) | 49.2y | | Redhill Tech Sch | | 1 FINAL | Motspur Park | 30 May 1959 |
| 49.2 | | Hercules Wimbledon AC | | 1 FINAL | Motspur Park | 30 April 1977 |
| 49.2 | | Hercules Wimbledon AC | | 1 FINAL | Motspur Park | 29 April 1978 |
| 49.2 | | Croydon Harriers | | 1 HEAT 2 | Croydon Arena | 23 April 1983 |
(56) | 49.25 | | Woking AC | | 5 FINAL | Carshalton | 12 September 2021 |
(57) | 49.3y | | Ashburton School, Croydon | | 1 FINAL | Motspur Park | 28 May 1960 |
| 49.3 | | Hercules Wimbledon AC | | 1 HEAT 1 | Motspur Park | 29 April 1978 |
(59) | 49.39 | | Herne Hill H 'B' | | 5 HEAT 1 | Carshalton | 4 September 2022 |
(60) | 49.4 | | Wandsworth School | | 3 FINAL | Croydon Arena | 23 April 1983 |
| 49.4 | | Woking AC | | 1 FINAL | Sheerwater, Woking | 24 April 1988 |
(62) | 49.44 | | Hercules Wimbledon AC 'B' | (Hercules Wimbledon AC) | 5 FINAL | Carshalton | 8 September 2019 |
(63) | 49.5y | | St 'Georges College | | 2 FINAL | Motspur Park | 30 May 1959 |
| 49.5y | | Dulwich College | | 3 FINAL | Motspur Park | 30 May 1959 |
| 49.5 | | Hercules Wimbledon AC | | 1 HEAT 1 | Motspur Park | 30 April 1977 |
(66) | 49.56 | | Epsom & Ewell Harriers | | 3 FINAL | Carshalton | 3 September 2023 |
(67) | 49.6 | | Woking AC | | 1 HEAT 1 | Sheerwater, Woking | 24 April 1988 |
(68) | 49.7y | | Raynes Park CGS | | 1 FINAL | Wimbledon Park | 9 May 1964 |
| 49.7 | | Croydon Harriers | | 1 HEAT 2 | Kingsmeadow Stadium | 13 September 1992 |
(70) | 49.74 | | Hercules Wimbledon AC | | 1 FINAL | Carshalton | 14 September 2014 |
(71) | 49.8 | | Epsom & Ewell Harriers | | 1 FINAL | Wimbledon Park | 14 April 1973 |
| 49.8 | | Mitcham & Sutton AC 'B' | | 2 FINAL | Tooting Bec | 26 April 1986 |
(73) | 49.9 | | Epsom & Ewell Harriers | | - HEATS | Wimbledon Park | 15 May 1971 |
| 49.9 | | Camberley & District AC | | 1 FINAL | Tooting Bec | 25 April 1987 |
(75) | 50.0 | | Beaufoy School. Lambeth | (Beaufoy School, Lambeth) | 3 FINAL | Crystal Palace | 23 July 1968 |
| 50.0 | | Garth High School | | 2 FINAL | Tooting Bec | 25 April 1987 |
| 50.0 | | Ranelagh Harriers | | 2 HEAT 1 | Sheerwater, Woking | 23 April 1989 |
(78) | 50.03 | | Sutton & District AC 'A' | | 3 FINAL | Carshalton | 10 September 2017 |
(79) | 50.1y | | Goldsworth School | | 2 FINAL | Motspur Park | 28 May 1960 |
| 50.1y | | Wandsworth School | | 1 FINAL | Wimbledon Park | 7 May 1966 |
| 50.1 | | Surrey AC 'A' | | 1 HEAT 2 | Motspur Park | 30 April 1977 |
| 50.1 | | Ranelagh Harriers | | 2 FINAL | Sheerwater, Woking | 23 April 1989 |
| 50.1 | | Guildford & Godalming AC | | 2 FINAL | Kingsmeadow Stadium | 22 September 1991 |
| 50.1 | | Ewell Castle School | | 2 FINAL | Croydon Arena | 14 May 1995 |
(85) | 50.17 | | Kingston AC & Polytechnic H | | 6 FINAL | Carshalton | 4 September 2022 |
(86) | 50.2 | | Stockwell Manor School | | 1 FINAL | Wimbledon Park | 15 May 1971 |
| 50.2 | | Aldershot, Farnham & District AC | | - HEATS | Wimbledon Park | 15 May 1971 |
| 50.2 | | Sutton & Cheam Harriers | | 2 FINAL | Motspur Park | 30 April 1977 |
| 50.2 | | Croydon Harriers | | 1 FINAL | Motspur Park | 26 April 1980 |
| 50.2 | | Surrey AC | | 2 FINAL | Motspur Park | 26 April 1980 |
| 50.2 | | Wandsworth School | | 2 HEAT 1 | Croydon Arena | 23 April 1983 |
| 50.2 | | Croydon Harriers | | 1 FINAL | Croydon Arena | 28 April 1984 |
| 50.2 | | Hercules Wimbledon AC | | 2 FINAL | Sutton Arena | 11 September 1994 |
(94) | 50.23 | | Epsom & Ewell Harriers | | 2 FINAL | Carshalton | 13 September 2015 |
(95) | 50.29 | | Kingston AC & Polytechnic H | | 2 HEAT 2 | Carshalton | 4 September 2022 |
(96) | 50.3y | | Wimbledon College | | 4 FINAL | Motspur Park | 30 May 1959 |
| 50.3 | | Aldershot, Farnham & District AC | | 2 FINAL | Wimbledon Park | 15 May 1971 |
| 50.3 | | Surrey AC | | 2 FINAL | Motspur Park | 29 April 1978 |
(99) | 50.34 | | Kingston AC & Polytechnic Harriers | | 4 FINAL | Carshalton | 3 September 2023 |
(100) | 50.4y | | | (John Fisher School, Purley) | 3 FINAL | Wimbledon Park | 26 May 1962 |
| 50.4 | | Beverley Boys School | | 3 FINAL | Wimbledon Park | 15 May 1971 |
| 50.4 | | KCS Wimbledon | | 4 FINAL | Wimbledon Park | 15 May 1971 |
| 50.4 | | Belgrave Harriers | | 1 FINAL | Croydon Arena | 27 April 1985 |
|
103 performances of 50.40 or better. |