EVENT 101 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Alexander HUTCHISON | 9 | Co Leeds | 7:30.00 |
| 3 | 4 | Toby BIGWOOD | 10 | Blackburn | 7:18.20 |
| 4 | 6 | George BEILBY-WOODWARD | 11 | Co Leeds | 7:10.00 |
| 5 | 5 | Reuben BARKER | 10 | Co Leeds | 7:15.00 |
| 6 | 3 | David MCINTOSH | 9 | Co Leeds | 7:26.09 |
| 7 | 1 | Henry ROLLINGS | 11 | Co Leeds | 7:32.10 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 8 | Dexter ROWLANDS | 11 | Co Leeds | 7:01.00 |
| 1 | 10 | Finley SMITH | 10 | Co Leeds | 6:44.75 |
| 2 | 12 | Jacob CAWOOD | 11 | Co Leeds | 6:38.88 |
| 3 | 14 | Alfred WHITELL | 11 | Co Manch Aq | 6:30.50 |
| 4 | 16 | Henry PATTERSON | 11 | Co Leeds | 6:25.95 |
| 5 | 15 | Lucas THORPE | 11 | Warrington W | 6:27.80 |
| 6 | 13 | Taylor PRINCE | 12 | Conwy | 6:31.20 |
| 7 | 11 | Theo SIRA | 11 | Co Leeds | 6:44.67 |
| 8 | 9 | Adam MOHAMED | 9 | Co Leeds | 6:45.00 |
| 9 | 7 | Fraser GALBRAITH | 11 | Co Leeds | 7:02.89 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 18 | Ted WINGFIELD | 11 | Co Leeds | 6:15.00 |
| 1 | 20 | George RICKETTS | 12 | Co Leeds | 6:12.88 |
| 2 | 22 | Hisoka O'BRIEN | 13 | Warrington W | 6:06.10 |
| 3 | 24 | Oliver BARKER | 12 | Co Leeds | 5:51.48 |
| 4 | 26 | Jack MCCOY | 15 | Warrington W | 5:46.00 |
| 5 | 25 | Zachary WHITTAKER | 12 | Co Leeds | 5:48.77 |
| 6 | 23 | David GRIGORE | 12 | Co Leeds | 6:01.46 |
| 7 | 21 | Abdullah MOKHLISSE | 15 | Chapeltown | 6:10.80 |
| 8 | 19 | Samuel FORD | 11 | Co Leeds | 6:12.97 |
| 9 | 17 | Yin Ho Adrian CHAN | 11 | Co Leeds | 6:17.48 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 28 | Cameron MILLER | 12 | N Ayrshire | 5:35.58 |
| 1 | 30 | Enzo SHILAND-GRIFFITHS | 14 | Caernarfon | 5:33.20 |
| 2 | 32 | Oliwier ZAJAC | 15 | Warrington W | 5:28.80 |
| 3 | 34 | Oliver BARRETT | 14 | Co Leeds | 5:23.37 |
| 4 | 36 | Cameron HAMILL | 16 | N Ayrshire | 5:16.90 |
| 5 | 35 | Jackson CLARKE | 15 | Co Leeds | 5:20.31 |
| 6 | 33 | Oscar O'DONNELL | 13 | Co Leeds | 5:27.03 |
| 7 | 31 | Oscar HUSSEY | 13 | Co Leeds | 5:29.44 |
| 8 | 29 | Callum FOZARD | 14 | Co Leeds | 5:33.55 |
| 9 | 27 | Olaf GRUDOWSKI | 13 | Co Leeds | 5:40.40 |