EVENT 301 Female 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 2 | Chloe TAYLOR | 10 | Middlesboro | 7:24.00 |
| 1 | 4 | Madison SIMMONDS | 11 | Donc Dartes | 7:15.90 |
| 2 | 6 | Grace O'HARA | 11 | Co Leeds | 7:09.15 |
| 3 | 8 | Betsy KIRKLEY | 10 | Co Leeds | 6:51.10 |
| 4 | 10 | Evelyn ATKINSON | 10 | Co Leeds | 6:40.00 |
| 5 | 9 | Rosie BROGDEN | 11 | Co Leeds | 6:45.00 |
| 6 | 7 | Eva LONGLEY | 11 | Donc Dartes | 7:00.00 |
| 7 | 5 | Evie COOK | 10 | Co Leeds | 7:13.12 |
| 8 | 3 | Verity LILLEY | 11 | Co Leeds | 7:18.40 |
| 9 | 1 | Jessica AYRE | 11 | Middlesboro | 7:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 12 | Neve STAFFORD | 10 | Co Leeds | 6:37.86 |
| 1 | 15 | Addison CROPPER | 10 | Co Leeds | 6:23.80 |
| 2 | 17 | Lily VEEVERS | 12 | Co Leeds | 6:20.90 |
| 3 | 19 | Ava BRADLEY | 13 | Co Leeds | 6:03.81 |
| 4 | 23 | Emily MARRISON | 13 | Co Leeds | 5:56.80 |
| 5 | 22 | Jessica ROLLINGS | 12 | Co Leeds | 5:57.10 |
| 6 | 18 | Millie DEY | 12 | Donc Dartes | 6:13.20 |
| 7 | 16 | Evie Mae WALLACE | 12 | Co Leeds | 6:23.20 |
| 8 | 14 | Eva SYLVESTER | 11 | Co Leeds | 6:25.08 |
| 9 | 11 | Willow WRIGHT | 10 | Co Leeds | 6:39.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 25 | Darcey BLACKER | 15 | Co Leeds | 5:47.60 |
| 1 | 27 | Letian WU | 14 | Trafford Met | 5:39.00 |
| 2 | 29 | Katie PINK | 16 | Middlesboro | 5:29.60 |
| 3 | 31 | Ella MCDERMOTT | 15 | Co Leeds | 5:28.20 |
| 4 | 33 | Charlotte BASHFORD | 15 | Middlesboro | 5:25.10 |
| 5 | 32 | Charlotte MORETON | 15 | Co Leeds | 5:26.86 |
| 6 | 30 | Isabelle HALL | 12 | Co Leeds | 5:29.10 |
| 7 | 28 | Ella JORDAN | 13 | Co Leeds | 5:38.70 |
| 8 | 26 | Ella PROUD | 16 | Middlesboro | 5:42.60 |
| 9 | 24 | Taya WINGFIELD | 12 | Co Leeds | 5:54.60 |