(1) | 42.70 | CBP | Herne Hill Harriers | | 1 FINAL | Sutton Arena | 9 September 2012 |
(2) | 42.80 | | Herne Hill Harriers | | 1 FINAL | Sutton Arena | 8 September 2013 |
(3) | 42.99 | | Herne Hill Harriers 'A' | | 1 FINAL | Carshalton | 3 September 2023 |
(4) | 43.64 | | Herne Hill Harriers 'A' | | 1 HEAT 2 | Carshalton | 3 September 2023 |
(5) | 43.70 | | Woking AC 'A' | (Woking AC) | 1 FINAL | Carshalton | 8 September 2019 |
(6) | 43.87 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 14 September 2014 |
(7) | 44.06 | | Hercules Wimbledon AC | | 2 FINAL | Carshalton | 3 September 2023 |
(8) | 44.1 | CBP | Croydon Harriers 'A' | | 1 FINAL | Tooting Bec | 25 April 1987 |
(9) | 44.13 | | Epsom & Ewell Harriers 'A' | | 3 FINAL | Carshalton | 3 September 2023 |
(10) | 44.2 | | Woking AC | | 1 FINAL | Carshalton | 9 September 2018 |
(11) | 44.39 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 13 September 2015 |
(12) | 44.50 | | Hercules Wimbledon AC | | 1 HEAT 1 | Carshalton | 3 September 2023 |
(13) | 44.6 | | Hercules Wimbledon AC | (Hercules Wimbledon AC) | 1 FINAL | Stompond Lane, Walton | 19 September 1993 |
(14) | 44.64 | | Hercules Wimbledon AC | | 1 FINAL | Carshalton | 12 September 2021 |
(15) | 44.69 | | Hercules Wimbledon AC | (Hercules Wimbledon AC) | 1 FINAL | Carshalton | 4 September 2022 |
(16) | 44.92 | | Kingston AC & Polytechnic Harriers | | 2 FINAL | Carshalton | 12 September 2021 |
(17) | 45.0 | | Croydon Harriers | | 1 FINAL | Sheerwater, Woking | 22 April 1989 |
(18) | 45.09 | | Epsom & Ewell Harriers 'A' | | 2 HEAT 2 | Carshalton | 3 September 2023 |
(19) | 45.1 | | Epsom & Ewell Harriers 'A' | | 1 FINAL | Ewell Court | 6 May 1972 |
| 45.1 | | Belgrave Harriers | | 1 FINAL | Croydon Arena | 27 April 1985 |
(21) | 45.2y | CBP | Mitcham AC | | 1 FINAL | Battlebridge | 10 June 1961 |
(22) | 45.24 | | Kingston AC & Polytechnic Harriers | (Kingston AC & Polytechnic Harriers) | 2 FINAL | Carshalton | 8 September 2019 |
(23) | 45.27 | | Epsom & Ewell Harriers | | 1 FINAL | Carshalton | 11 September 2016 |
(24) | 45.3 | | Epsom & Ewell Harriers | | 1 FINAL | Wimbledon Park | 14 April 1973 |
| 45.3 | | Belgrave Harriers | (Belgrave Harriers) | 2 FINAL | Stompond Lane, Walton | 19 September 1993 |
|
25 performances of 45.30 or better. |