(1) | 38.98 | CBP | Twinelle Hopeson | (Croydon Harriers) | 1 FINAL | Kingsmeadow Stadium | 10 May 2008 |
(2) | 39.36 | | Amy Allcock | (Aldershot, Farnham & District AC) | 2 FINAL | Kingsmeadow Stadium | 10 May 2008 |
(3) | 39.66 | | Ellie Grove | (Guildford & Godalming AC) | 1 FINAL | Kingsmeadow Stadium | 23 May 2015 |
(4) | 39.73 | | Shona Richards | (Epsom & Ewell Harriers) | 1 FINAL | Kingsmeadow Stadium | 12 May 2012 |
(5) | 40.17 | | Sophie Osborn | (Epsom & Ewell Harriers) | 1 FINAL | Kingsmeadow Stadium | 14 May 2022 |
(6) | 40.28 | CBP | Mary Iheke | (Kingston AC & Polytechnic Harriers) | 1 FINAL | Kingsmeadow Stadium | 12 May 2007 |
(7) | 40.30 | | Sophie Osborn | (Epsom & Ewell Harriers) | 1 HEAT 2 | Kingsmeadow Stadium | 14 May 2022 |
(8) | 40.41 | | Victoria Hewett | (Woking AC) | 2 FINAL | Kingsmeadow Stadium | 12 May 2007 |
| 40.41 | | Alex Shaw | (Guildford & Godalming AC) | 1 FINAL | Kingsmeadow Stadium | 14 May 2016 |
(10) | 40.46 | | Jessie Knight | (Epsom & Ewell Harriers) | 1 FINAL | Kingsmeadow Stadium | 9 May 2009 |
|
10 performances of 40.46 or better. |