EVENT 301 Boy/Girl 12 Yrs/Under 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Elizabeth BOND | 9 | Co Leeds | 8:01.01 |
| 2 | 3 | Seth JONES | 10 | Co Leeds | 7:30.77 |
| 3 | 5 | Penelope DALLIMORE | 10 | Co Leeds | 7:04.38 |
| 4 | 7 | Halo BENTLEY-HICKS | 10 | Co Leeds | 6:46.24 |
| 5 | 6 | Matei STOICESCU | 11 | Co Leeds | 6:57.00 |
| 6 | 4 | Oliver BARRETT | 10 | Co Leeds | 7:11.73 |
| 7 | 2 | Lily VEEVERS | 10 | Co Leeds | 7:36.56 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Holly HARRISON | 11 | Co Leeds | 6:39.48 |
| 1 | 11 | Scarlett CLARKSON | 11 | Co Leeds | 6:28.34 |
| 2 | 13 | Zachary HELM | 12 | Co Leeds | 6:22.80 |
| 3 | 15 | Asher MAXFIELD | 12 | Co Leeds | 5:56.75 |
| 4 | 17 | Matilda POTTER | 12 | Co Leeds | 5:54.09 |
| 5 | 16 | Aira WILKINSON | 12 | Co Leeds | 5:56.65 |
| 6 | 14 | Jacob O'DONNELL | 11 | Co Leeds | 6:20.73 |
| 7 | 12 | Carey SULLIVAN | 11 | Co Manch Aq | 6:25.09 |
| 8 | 10 | Tylan FLETCHER | 12 | Co Leeds | 6:30.13 |
| 9 | 8 | Zach PIERCY | 11 | Co Leeds | 6:42.57 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Liliah VINCENT | 12 | Co Leeds | 5:45.22 |
| 1 | 21 | Isabel HANDLEY | 12 | Co Leeds | 5:37.07 |
| 2 | 24 | Elizabeth DIXON | 12 | Co Leeds | 5:27.88 |
| 3 | 26 | Evie CLARE | 12 | Co Manch Aq | 5:20.82 |
| 4 | 28 | Darcey CROSSLEY | 12 | Co Leeds | 5:08.59 |
| 5 | 27 | Millie THRELFALL | 12 | Co Leeds | 5:16.47 |
| 6 | 25 | Sophie RAMSHAW | 12 | Co Leeds | 5:22.18 |
| 7 | 23 | William HICKLIN | 12 | Co Leeds | 5:28.43 |
| 8 | 20 | Megan TRAVIS | 12 | Co Leeds | 5:44.70 |
| 9 | 18 | Caitlyn SMITH | 12 | Co Leeds | 5:46.80 |