(1) | 40.02 | CBP | Holly Ryan | (Shaftesbury Barnet Harriers) | 1 FINAL | Kingsmeadow Stadium | 12 May 2024 |
(2) | 40.39 | | Tia Garrard | (Kingston AC & Polytechnic Harriers) | 2 FINAL | Kingsmeadow Stadium | 12 May 2024 |
(3) | 41.45 | CBP | Katie Sakaria | (Guildford & Godalming AC) | 1 FINAL | Kingsmeadow Stadium | 12 May 2019 |
(4) | 41.77 | | Lily-Rose Brown | (Herne Hill Harriers) | 1 FINAL | Kingsmeadow Stadium | 15 May 2022 |
(5) | 41.81 | | Tia Garrard | (Kingston AC & Polytechnic Harriers) | 1 HEAT 2 | Kingsmeadow Stadium | 12 May 2024 |
(6) | 42.09 | CBP | Katie Sakaria | (Guildford & Godalming AC) | 1 HEAT 1 | Kingsmeadow Stadium | 12 May 2019 |
(7) | 42.18 | | Vivienne Jonczyk | (Hercules Wimbledon AC) | 1 FINAL | Kingsmeadow Stadium | 14 May 2023 |
(8) | 42.20 | | Lily-Rose Brown | (Herne Hill Harriers) | 1 HEAT 1 | Kingsmeadow Stadium | 15 May 2022 |
(9) | 42.22 | | Emma Fisher | (Walton AC) | 2 FINAL | Kingsmeadow Stadium | 12 May 2019 |
(10) | 42.38 | | Grace Connor | (Guildford & Godalming AC) | 2 FINAL | Kingsmeadow Stadium | 15 May 2022 |
(11) | 42.43 | CBP | Olivia James | (Camberley & District AC) | 1 FINAL | Kingsmeadow Stadium | 13 May 2018 |
(12) | 42.44 | | Holly Ryan | (Guildford & Godalming AC) | 2 FINAL | Kingsmeadow Stadium | 14 May 2023 |
(13) | 42.50 | | Lucy Wright | (Herne Hill Harriers) | 3 FINAL | Kingsmeadow Stadium | 15 May 2022 |
(14) | 42.53 | CBP | Olivia James | (Camberley & District AC) | 1 HEAT 2 | Kingsmeadow Stadium | 13 May 2018 |
(15) | 42.57 | | Grace Connor | (Guildford & Godalming AC) | 1 HEAT 2 | Kingsmeadow Stadium | 15 May 2022 |
(16) | 42.74 | | Julia Newman | (Sutton & District AC) | 1 HEAT 2 | Kingsmeadow Stadium | 1 August 2021 |
(17) | 42.81 | | Freya McAndie | (Hercules Wimbledon AC) | 3 FINAL | Kingsmeadow Stadium | 12 May 2024 |
(18) | 42.82 | | Amy Mcloughlin | (Walton AC) | 1 HEAT 1 | Kingsmeadow Stadium | 12 May 2024 |
(19) | 42.89 | CBP | Susannah Lecoutre | (Guildford & Godalming AC) | 1 HEAT 1 | Kingsmeadow Stadium | 13 May 2018 |
(20) | 42.90 | CBP | Zoe Dake | (Croydon Harriers) | 1 FINAL | Kingsmeadow Stadium | 14 May 2017 |
| 42.90 | | Holly Ryan | (Shaftesbury Barnet Harriers) | 1 HEAT 3 | Kingsmeadow Stadium | 12 May 2024 |
(22) | 42.92 | | Gabriella Berkeley-Agyepong | (Croydon Harriers) | 3 FINAL | Kingsmeadow Stadium | 12 May 2019 |
(23) | 42.93 | | Sian Popham | (Walton AC) | 4 FINAL | Kingsmeadow Stadium | 12 May 2019 |
| 42.93 | | Sophie Wright | (Herne Hill Harriers) | 2 HEAT 1 | Kingsmeadow Stadium | 12 May 2024 |
(25) | 42.94 | CBP | Zoe Dake | (Croydon Harriers) | 1 FINAL | Kingsmeadow Stadium | 15 May 2016 |
| 42.94 | | Gabriella Berkeley-Agyepong | (Croydon Harriers) | 2 HEAT 1 | Kingsmeadow Stadium | 12 May 2019 |
|
26 performances of 42.94 or better. |