EVENT 101 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Lucy BISCOE | 10 | Team Luton | |
| 4 | 4 | Leonie TALARCZYK-BROWN | 11 | Wycombe Dist | |
| 5 | 3 | Charlotte FITZHERBERT | 12 | Wycombe Dist | |
| 6 | 1 | Annabel HEWITT | 12 | Wycombe Dist | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Nicole CALIN | 12 | Ealing | |
| 2 | 10 | Carolina PRUSAK | 13 | Team Luton | 7:00.54 |
| 3 | 13 | Keira Rose BOUQUET | 12 | Ealing | 6:34.30 |
| 4 | 15 | Cora PAYNE | 11 | Dunstable | 6:12.92 |
| 5 | 14 | Liara HUGHES | 13 | Wycombe Dist | 6:28.50 |
| 6 | 11 | Amelie WOODWARD | 13 | Wycombe Dist | 6:52.70 |
| 7 | 9 | Willow LACEY | 10 | Wycombe Dist | |
| 8 | 5 | Lexi WARWICK | 12 | Wycombe Dist | |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 17 | Rahil ABWOOLI | 12 | TigersJersey | 6:08.40 |
| 2 | 19 | Amelia HARDWICK | 12 | TigersJersey | 5:53.70 |
| 3 | 21 | Mia ECKLEY | 12 | Co Milton K | 5:37.65 |
| 4 | 23 | Florence WHITTAKER | 15 | Biggleswade | 5:30.16 |
| 5 | 22 | Victoria GRANT | 12 | TigersJersey | 5:30.86 |
| 6 | 20 | Annabelle SAINS | 13 | Co Milton K | 5:43.19 |
| 7 | 18 | Hailey Hong Yuen LEUNG | 15 | Harpenden | 6:00.59 |
| 8 | 16 | Annabella SCOTT | 12 | Ealing | 6:11.31 |