EVENT 308 Mixed 1500m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 2 | Leo LI | 11 | Co Leeds | 23:18.40 |
| 1 | 4 | Grace O'HARA | 11 | Co Leeds | 23:00.00 |
| 2 | 6 | Elizabeth BOND | 11 | Co Leeds | 22:30.00 |
| 3 | 9 | Freya ELLIS | 11 | Co Leeds | 21:30.00 |
| 4 | 11 | Angus YOUNG | 12 | Co Leeds | 21:30.00 |
| 5 | 10 | Evie-Rose TOPPING | 12 | Co Leeds | 21:30.00 |
| 6 | 7 | Livia STACEY | 12 | Co Leeds | 22:30.00 |
| 7 | 5 | Noah DARNELL | 12 | Co Leeds | 22:50.26 |
| 8 | 3 | Amelie COTTERILL | 11 | Co Leeds | 23:00.00 |
| 9 | 1 | Owen TEMPEST | 12 | Co Leeds | 23:22.71 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 13 | Zoe FEATHER | 10 | Co Leeds | 21:30.00 |
| 1 | 15 | Alfie YOUNG | 14 | Co Leeds | 20:59.59 |
| 2 | 17 | Oscar O'DONNELL | 11 | Co Leeds | 20:30.00 |
| 3 | 19 | Shae BRYANT | 13 | Co Leeds | 19:59.71 |
| 4 | 21 | Jacob IRVING | 12 | Co Liverpool | 19:53.39 |
| 5 | 20 | Oliver BARRETT | 12 | Co Leeds | 19:57.60 |
| 6 | 18 | Amit MALTZ | 13 | Co Leeds | 20:00.00 |
| 7 | 16 | Ella JORDAN | 13 | Co Leeds | 20:51.46 |
| 8 | 14 | Emily ENGLAND-HALL | 11 | Co Leeds | 21:00.00 |
| 9 | 12 | Alfie CRAGGS | 12 | Co Leeds | 21:30.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 23 | Matei STOICESCU | 13 | Co Leeds | 19:31.53 |
| 1 | 25 | Isabelle HALL | 12 | Co Leeds | 19:01.87 |
| 2 | 27 | Zachary FIDAN | 13 | Teddington | 18:45.50 |
| 3 | 29 | Patrick O'HARA | 13 | Co Leeds | 18:37.72 |
| 4 | 31 | Joseph HALL | 15 | Co Leeds | 17:14.34 |
| 5 | 30 | Oliver INGHAM | 15 | Co Salford | 18:25.41 |
| 6 | 28 | Alexander BROWN | 13 | Alnwick Dol | 18:45.00 |
| 7 | 26 | Millie DARRAND | 14 | York City | 18:50.79 |
| 8 | 24 | George CARRY | 15 | Co Leeds | 19:18.92 |
| 9 | 22 | Jackson CLARKE | 13 | Co Leeds | 19:39.71 |