| Under-15 Girls 300 Metres |
| 40.8 | Shona Richards | Epsom & Ewell Harriers | Wimbledon Park | 31/07/2010 |
| 40.8 | Maya Bruney | Blackheath & Bromley Harriers AC | Bromley | 30/05/2011 |
| 40.36 | Arabella Wilson | Winchester & District AC | Manchester (SC) | 11/07/2021 |
| 39.11 | Lily-Rose Brown | Herne Hill Harriers | Chelmsford | 14/08/2022 |
| KEY |
| | i Indoor performance | |
| | * Old specification javelin | |
| | mx Performance achieved in mixed sex race | |
| NOTE. A 3-character code between the club and the venue indicates that the athlete was not eligible to represent GB at the time of the performance but did have a Surrey County qualification. |
