| Heat Number - 1 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Alice MAGUIRE | 12 | Saffron Wald | |
| 4 | 4 | Amelia JN BAPTISTE | 10 | Bark & Dagen | 3:46.40 |
| 5 | 2 | Chloe SMITH | 14 | Wycombe Dist | |
| Heat Number - 2 | |||||
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Keira Rose BOUQUET | 12 | Ealing | 3:34.09 |
| 2 | 8 | Emily PALLETT | 13 | Co Milton K | 3:12.23 |
| 3 | 11 | Annabelle SAINS | 13 | Co Milton K | 2:48.64 |
| 4 | 13 | Freya MAY | 15 | Leiston | 2:34.61 |
| 5 | 12 | Florence WHITTAKER | 15 | Biggleswade | 2:35.36 |
| 6 | 9 | Annabel HEWITT | 12 | Wycombe Dist | 3:10.30 |
| 7 | 6 | Phoebe DOUGLAS | 13 | Bo Southend | 3:14.49 |