| Heat Number - 1 | ||||||
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 2 | Maisie Catt | 14 | S7 | RichmondDale | 43.97 |
| 1 | 4 | Iona Winnifrith | 12 | S6 | Tonbridge | 40.46 |
| 2 | 6 | Evie Hallas | 15 | S10 | Wycombe Dist | 37.82 |
| 3 | 8 | Lily Herring | 15 | S10 | Norfolk Vikg | 36.16 |
| 4 | 10 | Rebecca Hardy-Bishop | 23 | S13 | Jersey | 33.85 |
| 5 | 9 | Ella Williams | 16 | S13 | Swindon | 35.09 |
| 6 | 7 | Mwaba Mkwasa | 18 | S8 | Norwich Swan | 37.23 |
| 7 | 5 | Ida Corcoran | 14 | S9 | Flitwick | 39.60 |
| 8 | 3 | Iris Turner | 16 | S8 | Wycombe Dist | 40.79 |
| 9 | 1 | Rose Webb | 12 | S6 | Northampton | 45.38 |