(1) | 48.49 | CBP | Guildford & Godalming AC | (Guildford & Godalming AC) | 1 FINAL | Carshalton | 11 September 2016 |
(2) | 48.95 | CBP | Herne Hill Harriers | | 1 FINAL | Carshalton | 13 September 2015 |
(3) | 49.16 | | Kingston AC & Polytechnic Harriers | (Kingston AC & Polytechnic Harriers) | 1 FINAL | Carshalton | 8 September 2019 |
(4) | 49.28 | | Kingston AC & Polytechnic Harriers | (Kingston AC & Polytechnic Harriers) | 1 HEAT 1 | Carshalton | 8 September 2019 |
(5) | 49.43 | | Sutton & District AC | | 2 FINAL | Carshalton | 13 September 2015 |
(6) | 49.68 | | Herne Hill Harriers 'B' | | 1 FINAL | Carshalton | 12 September 2021 |
(7) | 49.84 | | Herne Hill Harriers 'A' | (Herne Hill Harriers) | 2 FINAL | Carshalton | 11 September 2016 |
(8) | 50.05 | | Woking AC | | 1 FINAL | Carshalton | 10 September 2017 |
(9) | 50.10 | | Woking AC | (Woking AC) | 3 FINAL | Carshalton | 11 September 2016 |
(10) | 50.24 | | Epsom & Ewell Harriers | | 1 FINAL | Carshalton | 3 September 2023 |
(11) | 50.41 | CBP | Woking AC | | 1 FINAL | Carshalton | 14 September 2014 |
(12) | 50.47 | | Hercules Wimbledon AC | | 2 FINAL | Carshalton | 12 September 2021 |
(13) | 50.54 | | Herne Hill Harriers 'A' | (Herne Hill Harriers) | 2 FINAL | Carshalton | 8 September 2019 |
(14) | 50.6 | | Sutton & District AC | | 1 FINAL | Carshalton | 9 September 2018 |
(15) | 50.75 | | Herne Hill Harriers | | 2 FINAL | Carshalton | 3 September 2023 |
(16) | 50.76 | | Hercules Wimbledon AC | | 3 FINAL | Carshalton | 3 September 2023 |
(17) | 50.85 | | Herne Hill Harriers 'A' | (Herne Hill Harriers) | 1 HEAT 2 | Carshalton | 8 September 2019 |
(18) | 50.95 | CBP | Woking AC | | 1 FINAL | Sutton Arena | 9 September 2012 |
(19) | 50.99 | | Hercules Wimbledon AC | (Hercules Wimbledon AC) | 3 FINAL | Carshalton | 8 September 2019 |
(20) | 51.08 | | Sutton & District AC | | 4 FINAL | Carshalton | 3 September 2023 |
(21) | 51.17 | | Woking AC | | 1 FINAL | Sutton Arena | 8 September 2013 |
(22) | 51.25 | | Sutton & District AC | | 2 FINAL | Carshalton | 14 September 2014 |
| 51.25 | | Herne Hill Harriers 'B' | (Herne Hill Harriers) | 4 FINAL | Carshalton | 11 September 2016 |
(24) | 51.3 | | Herne Hill Harriers | | 2 FINAL | Carshalton | 9 September 2018 |
(25) | 51.40 | | Woking AC | | 5 FINAL | Carshalton | 3 September 2023 |
|
25 performances of 51.40 or better. |