| Rank | Lane | ID | Name | PB | Team | Cat | Result | Info | Video |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | 3009 | (9) Imogen Wilson | Windsor & Maidenhead | U15 | 43.54 | Q | ||
| 2 | 1 | 3001 | (1) K Mair | Bracknell | U15 | 44.38 | Q | ||
| 3 | 3 | 3005 | (5) Annabel Bee | Reading | U15 | 46.07 | q | ||
| 4 | 6 | 3012 | (12) Georgia Boonham | Wokingham | U15 | 47.67 | q | ||
| 2 | 3004 | (4) C Dutertre-Delauny | West Berkshire | U15 | DNS |