| Heat Number - 1 | ||||||
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 2 | Rose Webb | 12 | SM6 | Northampton | 3:46.79 |
| 1 | 4 | Lily Herring | 15 | SM10 | Norfolk Vikg | 3:24.80 |
| 2 | 6 | Abigail Daly | 18 | SM14 | Devonport | 3:14.84 |
| 3 | 8 | Tylia Glynn | 17 | SM14 | Stockport Mo | 3:07.80 |
| 4 | 10 | Rebecca Hardy-Bishop | 23 | SM13 | Jersey | 3:02.45 |
| 5 | 9 | Ella Williams | 16 | SM13 | Swindon | 3:05.01 |
| 6 | 7 | Charlie-Morgan Imrie | 16 | SM14 | Nova Cent'n | 3:09.70 |
| 7 | 5 | Fallon Cooney | 21 | SM10 | Co Manch Aq | 3:16.45 |
| 8 | 3 | Mwaba Mkwasa | 18 | SM8 | Norwich Swan | 3:25.48 |
| 9 | 1 | Maisie Catt | 14 | SM7 | RichmondDale | 4:00.42 |