EVENT 101 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Elias BAYARRI | 10 | Co Sheffield | 7:35.00 |
| 4 | 3 | Fraser GALBRAITH | 10 | Co Leeds | 7:20.00 |
| 5 | 2 | Francis SALTHOUSE | 10 | Co Sheffield | 7:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Theo SIRA | 10 | Co Leeds | 7:10.00 |
| 3 | 7 | Finn EASINGWOOD | 11 | Co Leeds | 7:06.60 |
| 4 | 9 | Jacob ASKWITH | 12 | Co Sheffield | 6:55.36 |
| 5 | 8 | Devon BRADSHAW | 10 | Co Sheffield | 7:00.00 |
| 6 | 6 | Oscar CALAM | 10 | Co Leeds | 7:08.30 |
| 7 | 4 | Tyler GREEN | 10 | Co Leeds | 7:10.58 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Liam LI | 9 | Co Leeds | 6:48.52 |
| 2 | 13 | Noah SHEPHARD | 12 | Co Sheffield | 6:45.45 |
| 3 | 15 | Harry DIXON | 10 | Co Leeds | 6:33.70 |
| 4 | 17 | George KING | 11 | Co Leeds | 6:22.60 |
| 5 | 16 | Owen TEMPEST | 12 | Co Leeds | 6:22.78 |
| 6 | 14 | Eddie SMITH | 10 | Co Sheffield | 6:40.00 |
| 7 | 12 | Jacob ROCCHI | 13 | Co Sheffield | 6:47.70 |
| 8 | 10 | Alistair SALTHOUSE | 12 | Co Sheffield | 6:52.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Tomas BICKERS | 12 | Co Leeds | 6:19.23 |
| 2 | 21 | Dexter GROCOCK | 12 | Co Sheffield | 6:12.30 |
| 3 | 23 | Harrison WAKE | 12 | Co Leeds | 6:09.72 |
| 4 | 25 | Alfie CRAGGS | 13 | Co Leeds | 6:00.74 |
| 5 | 24 | Oliver BARKER | 11 | Co Leeds | 6:03.87 |
| 6 | 22 | Enzo SHILAND-GRIFFITHS | 13 | Caernarfon | 6:10.00 |
| 7 | 20 | Mason CAMERON | 13 | Co Sheffield | 6:18.58 |
| 8 | 18 | Demilade AYEMOWA | 13 | Co Leeds | 6:21.58 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 27 | Olaf GRUDOWSKI | 12 | Co Leeds | 5:54.85 |
| 2 | 29 | Owen WILLIAMS | 14 | Caernarfon | 5:31.37 |
| 3 | 31 | Reuben HARRISON | 14 | Co Leeds | 5:26.57 |
| 4 | 33 | Matei STOICESCU | 14 | Co Leeds | 5:12.90 |
| 5 | 32 | Ewan LEONARD | 15 | Conwy | 5:14.81 |
| 6 | 30 | Jackson CLARKE | 14 | Co Leeds | 5:27.50 |
| 7 | 28 | Callum FOZARD | 13 | Co Leeds | 5:46.37 |
| 8 | 26 | Harrison LEONARD | 12 | Conwy | 6:00.00 |