(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 |
(11) | 40.47 | CBP | Lauren Webb | (Sutton & District AC) | 1 FINAL | Kingsmeadow Stadium | 11 May 2002 |
(12) | 40.57 | | Amy Allcock | (Aldershot, Farnham & District AC) | 1 HEAT 1 | Kingsmeadow Stadium | 9 May 2009 |
(13) | 40.58 | | Jemma Wood | (Guildford & Godalming AC) | 2 FINAL | Kingsmeadow Stadium | 23 May 2015 |
(14) | 40.60 | | Caitlyn Harvey | (Kingston AC & Polytechnic Harriers) | 2 HEAT 2 | Kingsmeadow Stadium | 14 May 2022 |
(15) | 40.62 | | Caitlyn Harvey | (Kingston AC & Polytechnic Harriers) | 2 FINAL | Kingsmeadow Stadium | 14 May 2022 |
(16) | 40.63 | | Amy Allcock | (Aldershot, Farnham & District AC) | 2 FINAL | Kingsmeadow Stadium | 9 May 2009 |
(17) | 40.67 | | Jessie Knight | (Epsom & Ewell Harriers) | 1 FINAL | Kingsmeadow Stadium | 8 May 2010 |
(18) | 40.7 | CBP | Vicki Francis | (Mitcham & Sutton AC) | 1 HEAT 1 | Croydon Arena | 16 May 1992 |
(19) | 40.71 | | Sarah Harris | (Kingston AC & Polytechnic Harriers) | 1 FINAL | Kingsmeadow Stadium | 15 May 2004 |
(20) | 40.76 | | Chyna Russell | (Sutton & District AC) | 1 FINAL | Kingsmeadow Stadium | 13 May 2017 |
(21) | 40.78 | | Louisa Stoney | (Kingston AC & Polytechnic Harriers) | 1 HEAT 1 | Kingsmeadow Stadium | 12 May 2018 |
(22) | 40.8 | | Vicki Francis | (Mitcham & Sutton AC) | 1 FINAL | Croydon Arena | 16 May 1992 |
| 40.80 | | Amy Godsell | (Blackheath & Bromley Harriers AC) | 2 FINAL | Kingsmeadow Stadium | 15 May 2004 |
| 40.80 | | Jessie Knight | (Epsom & Ewell Harriers) | 1 HEAT 2 | Kingsmeadow Stadium | 9 May 2009 |
(25) | 40.88 | | Matilda Rainsborough | (Guildford & Godalming AC) | 2 FINAL | Kingsmeadow Stadium | 12 May 2012 |
|
25 performances of 40.88 or better. |