EVENT 501 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Benjamin LECK | 10 | Borocuda T | 7:45.00 |
| 4 | 3 | Toby BIGWOOD | 9 | Blackburn | 7:04.10 |
| 5 | 2 | Farris PICKARD | 9 | RichmondDale | 7:05.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Freddie BONNER | 9 | RichmondDale | 6:40.00 |
| 2 | 7 | Jacob MANSON | 10 | Borocuda T | 6:34.00 |
| 3 | 9 | David GRIGORE | 11 | Co Leeds | 6:20.00 |
| 4 | 11 | Harrison NORTON | 11 | Co Leeds | 6:18.76 |
| 5 | 10 | Yin Ho Adrian CHAN | 10 | Co Leeds | 6:20.00 |
| 6 | 8 | Edward HALL | 11 | RichmondDale | 6:26.80 |
| 7 | 6 | James TRETHOWAN | 11 | Borocuda T | 6:37.70 |
| 8 | 4 | Thomas HINDE | 11 | RichmondDale | 6:42.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 13 | Lewis LUNG | 11 | Co Leeds | 6:11.61 |
| 1 | 16 | Theo SIRA | 11 | Co Leeds | 6:00.70 |
| 2 | 18 | Finley CROASDALE | 11 | Clitheroe | 5:59.90 |
| 3 | 20 | Liam LI | 10 | Co Leeds | 5:54.50 |
| 4 | 22 | Harley GILL | 12 | Co Leeds | 5:38.90 |
| 5 | 21 | George RICKETTS | 11 | Co Leeds | 5:42.90 |
| 6 | 19 | Tykhon BORSHCHENKO | 11 | RichmondDale | 5:58.80 |
| 7 | 17 | Michael EASTWOOD | 14 | RichmondDale | 6:00.00 |
| 8 | 14 | Matthew OGBUAGU | 12 | Co Leeds | 6:08.00 |
| 9 | 12 | Edward JIANG | 11 | Thirsk WH | 6:14.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 24 | Tomas BICKERS | 12 | Co Leeds | 5:25.81 |
| 1 | 26 | Tyler RAVEN | 11 | Co Leeds | 5:23.33 |
| 2 | 28 | George GITTINS | 11 | Stokesley | 5:15.40 |
| 3 | 30 | Oliver BARKER | 11 | Co Leeds | 5:12.90 |
| 4 | 32 | Joshua CROZIER | 15 | RichmondDale | 5:12.40 |
| 5 | 31 | George KING | 12 | Co Leeds | 5:12.90 |
| 6 | 29 | Hogan LAM | 13 | Co Leeds | 5:14.80 |
| 7 | 27 | Toby BANKS | 15 | Eckington | 5:17.10 |
| 8 | 25 | Ellis HARGREAVES | 12 | Co Leeds | 5:23.72 |
| 9 | 23 | Noah LODGE | 13 | Eckington | 5:30.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 34 | Callum FOZARD | 13 | Co Leeds | 5:09.70 |
| 1 | 36 | Tristan PICKARD | 12 | RichmondDale | 5:06.20 |
| 2 | 38 | Angus YOUNG | 13 | Co Leeds | 5:01.32 |
| 3 | 40 | Ben BEDFORD | 15 | Clitheroe | 4:54.50 |
| 4 | 42 | William LANCASHIRE | 14 | Co Leeds | 4:52.00 |
| 5 | 41 | Oscar O'DONNELL | 12 | Co Leeds | 4:52.67 |
| 6 | 39 | Alfie CRAGGS | 13 | Co Leeds | 4:58.60 |
| 7 | 37 | Demilade AYEMOWA | 14 | Co Leeds | 5:03.89 |
| 8 | 35 | Charlie SCHOFIELD | 13 | Stokesley | 5:08.70 |
| 9 | 33 | Benjamin CLARK | 13 | Co Leeds | 5:10.78 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 44 | Jeffrey LANGE | 13 | Co Leeds | 4:50.00 |
| 1 | 46 | William TAYLOR | 14 | Thirsk WH | 4:48.50 |
| 2 | 48 | Jacob IRVING | 13 | Co Liverpool | 4:47.20 |
| 3 | 50 | Benjamin GLAISTER | 15 | RichmondDale | 4:45.20 |
| 4 | 52 | Alfie YOUNG | 15 | Co Leeds | 4:44.04 |
| 5 | 51 | Noah DARNELL | 13 | Co Leeds | 4:44.24 |
| 6 | 49 | Olaf GRUDOWSKI | 13 | Co Leeds | 4:46.30 |
| 7 | 47 | Oliver BARRETT | 13 | Co Leeds | 4:47.60 |
| 8 | 45 | Oliver ATHA | 13 | Co Leeds | 4:49.30 |
| 9 | 43 | Callum RAVEN | 16 | Co Leeds | 4:50.49 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 54 | Tymofii BORSHCHENKO | 15 | RichmondDale | 4:40.70 |
| 1 | 56 | Owen CARMODY | 14 | Co Leeds | 4:36.60 |
| 2 | 58 | Samuel HILL | 15 | Co Leeds | 4:29.96 |
| 3 | 60 | William WILSON | 14 | Co Leeds | 4:25.28 |
| 4 | 62 | Luke DYER | 17 | Co Leeds | 4:20.80 |
| 5 | 61 | Matthew JAMES | 16 | Co Leeds | 4:24.20 |
| 6 | 59 | Patrick O'HARA | 14 | Co Leeds | 4:27.03 |
| 7 | 57 | Arthur OWENS | 15 | Co Leeds | 4:30.18 |
| 8 | 55 | James THOMSON | 15 | Co Leeds | 4:37.40 |
| 9 | 53 | William DUNN | 13 | Co Leeds | 4:43.58 |