(1) | 53.6 | CBP | Michelle Pierre | (Croydon Harriers) | 1 FINAL | Wimbledon Park | 11 May 1997 |
(2) | 53.85 | | Nicole Kendall | (Thames Valley Harriers) | 1 FINAL | Kingsmeadow Stadium | 31 July 2021 |
(3) | 53.9 | CBP | Michelle Pierre | (Croydon Harriers) | 1 FINAL | Croydon Arena | 12 May 1996 |
(4) | 54.4 | CBP | Donna Fraser | (Croydon Harriers) | 1 FINAL | Croydon Arena | 19 May 1991 |
(5) | 54.5 | CBP | Lynne Draper | (Croydon Harriers) | 1 FINAL | Tooting Bec | 14 May 1988 |
(6) | 54.83 | | Jessie Knight | (Herne Hill Harriers) | 1 FINAL | Kingsmeadow Stadium | 23 May 2015 |
(7) | 54.9 | | Michelle Pierre | (Croydon Harriers) | 1 HEAT 1 | Wimbledon Park | 11 May 1997 |
(8) | 55.0 | | Jennifer Culley | (Belgrave Harriers) | 1 FINAL | Kingsmeadow Stadium | 12 May 2001 |
(9) | 55.02 | | Mary Iheke | (Kingston AC & Polytechnic Harriers) | 1 FINAL | Kingsmeadow Stadium | 25 May 2013 |
(10) | 55.2 | | Lynne Boult | (Croydon Harriers) | 2 FINAL | Croydon Arena | 19 May 1991 |
| 55.20 | | Michelle Pierre | (Shaftesbury Barnet Harriers) | 1 FINAL | Kingsmeadow Stadium | 11 May 2002 |
(12) | 55.21 | | Helen Pryer | (Windsor, Slough, Eton & Hounslow AC) | 1 FINAL | Kingsmeadow Stadium | 9 May 2009 |
(13) | 55.3 | | Olivia Hines | (Herne Hill Harriers) | 2 FINAL | Kingsmeadow Stadium | 12 May 2001 |
(14) | 55.4 | | Coral Davis | (Croydon Harriers) | 2 FINAL | Tooting Bec | 14 May 1988 |
| 55.4 | | Donna Fraser | (Croydon Harriers) | 1 FINAL | Croydon Arena | 15 May 1994 |
(16) | 55.5 | CBP | Shireen Hassan | (Croydon Harriers) | 1 FINAL | Motspur Park | 15 May 1982 |
| 55.5 | | Shireen Bailey | (Bromley Ladies AC) | 1 HEAT 1 | Motspur Park | 16 May 1985 |
| 55.5 | CBP= | Shireen Bailey | (Bromley Ladies AC) | 1 FINAL | Motspur Park | 18 May 1985 |
| 55.5 | | Linda Smith | (Croydon Harriers) | 1 FINAL | Croydon Arena | 19 May 1990 |
(20) | 55.6 | | Janet Martin | (Feltham AC) | 1 FINAL | Motspur Park | 13 May 1978 |
| 55.6 | | Elizabeth Williams | (Walton AC) | 1 FINAL | Croydon Arena | 13 May 2000 |
(22) | 55.64 | | Jennifer Culley | (Belgrave Harriers) | 2 FINAL | Kingsmeadow Stadium | 11 May 2002 |
(23) | 55.7 | | Shireen Hassan | (Croydon Harriers) | 1 HEAT 2 | Motspur Park | 13 May 1982 |
| 55.7 | | Shireen Bailey(Hassan) | (Croydon Harriers) | 1 FINAL | Motspur Park | 21 May 1983 |
| 55.7 | | Michelle Pierre | (Croydon Harriers) | 1 FINAL | Croydon Arena | 17 May 1992 |
(26) | 55.8y | CBP | Anne Smith | (Mitcham AC) | 1 FINAL | Wimbledon Park | 25 May 1968 |
| 55.8 | CBP | Virginia Graham | (Guildford & Godalming AC) | 1 FINAL | Motspur Park | 16 May 1981 |
| 55.8 | | Elona Reinalda | (Essex Ladies AC) | 2 FINAL | Croydon Arena | 12 May 1996 |
(29) | 55.84 | | Susan Bovill | (Sutton & District AC) | 1 FINAL | Kingsmeadow Stadium | 13 May 2007 |
(30) | 55.88 | | Jessie Knight | (Herne Hill Harriers) | 1 HEAT 1 | Kingsmeadow Stadium | 23 May 2015 |
(31) | 55.9 | | Jenny Pawsey | (Mitcham AC) | 1 FINAL | Wimbledon Park | 31 May 1969 |
| 55.9 | | Jeina Mitchell | (Croydon Harriers) | 2 FINAL | Wimbledon Park | 11 May 1997 |
| 55.9 | | Michelle Pierre | (Shaftesbury Barnet Harriers) | 3 FINAL | Kingsmeadow Stadium | 12 May 2001 |
(34) | 55.95 | | Michelle Pierre | (Shaftesbury Barnet Harriers) | 1 FINAL | Kingsmeadow Stadium | 15 May 2004 |
(35) | 56.0 | | Shireen Bailey(Hassan) | (Croydon Harriers) | 1 HEAT 2 | Motspur Park | 19 May 1983 |
(36) | 56.1 | | Virginia Graham | (Guildford & Godalming AC) | 2 FINAL | Motspur Park | 15 May 1982 |
| 56.1 | | Elizabeth Williams | (Walton AC) | 1 FINAL | Kingsmeadow Stadium | 9 May 1998 |
| 56.1 | | Joy Wright | (Herne Hill Harriers) | 2 FINAL | Croydon Arena | 13 May 2000 |
(39) | 56.14 | | Elizabeth Williams | (Walton AC) | 3 FINAL | Kingsmeadow Stadium | 11 May 2002 |
(40) | 56.2 | | Lisa Thompson | (Bromley Ladies AC) | 1 FINAL | Tooting Bec | 16 May 1987 |
| 56.2 | | Shireen Bailey | (Bromley Ladies AC) | 1 HEAT 1 | Tooting Bec | 16 May 1987 |
| 56.2 | | Shireen Bailey | (Bromley Ladies AC) | 2 FINAL | Tooting Bec | 16 May 1987 |
| 56.2 | | Liz Williams | (Walton AC) | 3 FINAL | Wimbledon Park | 11 May 1997 |
(44) | 56.24 | | Emily Parker | (Epsom & Ewell Harriers) | 1 FINAL | Kingsmeadow Stadium | 8 May 2010 |
(45) | 56.25 | | Laura Langowski | (Coventry Godiva Harriers) | 2 FINAL | Kingsmeadow Stadium | 9 May 2009 |
(46) | 56.3 | | Alison Dunn | (Epsom & Ewell Harriers) | 2 FINAL | Motspur Park | 13 May 1978 |
| 56.3 | | Nicola Lamb | (Croydon Harriers) | 2 FINAL | Croydon Arena | 15 May 1994 |
(48) | 56.37 | | Susan Bovill | (Sutton & District AC) | 3 FINAL | Kingsmeadow Stadium | 9 May 2009 |
(49) | 56.4 | | Lynn Taylor | (Woking AC) | 3 FINAL | Tooting Bec | 14 May 1988 |
| 56.4 | | Michelle Pierre | (Croydon Harriers) | 1 HEAT 2 | Croydon Arena | 17 May 1992 |
| 56.4 | | Michelle Pierre | (Croydon Harriers) | 3 FINAL | Croydon Arena | 15 May 1994 |
|
51 performances of 56.40 or better. |