(1) | 52.02 | CBP | Herne Hill Harriers | | 1 FINAL | Carshalton | 12 September 2015 |
(2) | 52.27 | | Croydon Harriers A | | 1 FINAL | Carshalton | 2 September 2023 |
(3) | 53.14 | | Woking AC | | 1 FINAL | Carshalton | 7 September 2019 |
(4) | 53.32 | | Epsom & Ewell Harriers | | 2 FINAL | Carshalton | 7 September 2019 |
(5) | 53.50 | | Woking AC | | 1 FINAL | Carshalton | 8 September 2018 |
(6) | 53.67 | | Herne Hill Harriers 'A' | | 1 FINAL | Carshalton | 3 September 2022 |
(7) | 53.76 | | Herne Hill Harriers | | 2 FINAL | Carshalton | 2 September 2023 |
(8) | 53.88 | CBP | Herne Hill Harriers | | 1 FINAL | Carshalton | 13 September 2014 |
(9) | 53.89 | | Kingston AC & Polytechnic H | | 2 FINAL | Carshalton | 13 September 2014 |
(10) | 54.05 | | Guildford & Godalming AC 'A' | | 3 FINAL | Carshalton | 7 September 2019 |
(11) | 54.12 | | Guildford & Godalming AC 'A' | | 2 FINAL | Carshalton | 3 September 2022 |
(12) | 54.20 | | Sutton & District AC A | | 2 FINAL | Carshalton | 12 September 2015 |
(13) | 54.34 | | Croydon Harriers | | 2 FINAL | Carshalton | 8 September 2018 |
(14) | 54.44 | | Herne Hill Harriers | | 3 FINAL | Carshalton | 8 September 2018 |
(15) | 54.48 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 10 September 2016 |
(16) | 54.5 | CBP | Mitcham & Sutton AC 'A' | | 1 HEAT 2 | Kingsmeadow Stadium | 22 September 1991 |
| 54.50 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 9 September 2017 |
(18) | 54.6 | | Mitcham & Sutton AC 'A' | | 1 FINAL | Kingsmeadow Stadium | 22 September 1991 |
(19) | 55.00 | | Woking AC | | 3 FINAL | Carshalton | 12 September 2015 |
(20) | 55.03 | | Sutton & District 'A' | | 1 FINAL | Sutton Arena | 7 September 2013 |
(21) | 55.07 | | Herne Hill Harriers | | 1 FINAL | Carshalton | 11 September 2021 |
(22) | 55.12 | | Kingston AC & Polytechnic Harriers | | 2 FINAL | Carshalton | 11 September 2021 |
(23) | 55.19 | | Woking AC | | 3 FINAL | Carshalton | 11 September 2021 |
(24) | 55.20 | | Woking AC | | 3 FINAL | Carshalton | 3 September 2022 |
(25) | 55.22 | | Herne Hill Harriers | | 2 FINAL | Sutton Arena | 7 September 2013 |
|
25 performances of 55.22 or better. |