EVENT 308 Girl Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Chloe TANGAYI | 13 | Northampton | 6:13.80 |
| 3 | 3 | Ella EDWARDS | 14 | Northampton | 5:44.90 |
| 4 | 2 | Lily FREEMAN | 14 | Northampton | 5:46.96 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Annabel VANCE | 14 | Northampton | 5:44.10 |
| 3 | 7 | Millie KING | 13 | Co Derby | 5:39.50 |
| 4 | 6 | Molly BRIERS | 15 | Deepings | 5:43.63 |
| 5 | 4 | Catherine ROBSON | 14 | Co Derby | 5:44.67 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Emilia CIESZCZYK | 14 | Northampton | 5:34.50 |
| 2 | 11 | Evie WOOLLEY | 15 | Northampton | 5:31.90 |
| 3 | 13 | Pia SUMMERS-NEWTON | 15 | Northampton | 5:25.40 |
| 4 | 12 | Louise EDMUNDS | 19 | Royal Wolv | 5:26.86 |
| 5 | 10 | Anna JOHNSON | 16 | Northampton | 5:32.60 |
| 6 | 8 | Matilda HASE | 14 | Derventio | 5:35.75 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Poppy MEAD | 16 | Derventio | 5:14.85 |
| 2 | 17 | Louise JONES | 16 | Royal Wolv | 5:08.04 |
| 3 | 19 | Chloe HARRIS | 16 | Royal Wolv | 4:59.34 |
| 4 | 18 | Eja COE | 15 | Derventio | 5:01.97 |
| 5 | 16 | Jessie-Leigh JENNS | 16 | Royal Wolv | 5:09.60 |
| 6 | 14 | Charlotte CULLEN | 17 | Royal Wolv | 5:17.02 |