EVENT 501 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Angus YOUNG | 10 | Co Leeds | 7:43.00 |
| 2 | 3 | Samuel WILLIAMS | 11 | Bolton Metro | 7:19.70 |
| 3 | 5 | Shae BRYANT | 11 | Co Leeds | 6:54.50 |
| 4 | 7 | Seth JONES | 11 | Co Leeds | 6:47.90 |
| 5 | 6 | Samuel HILL | 12 | Co Leeds | 6:52.10 |
| 6 | 4 | Joshua MCMILLAN | 10 | Co Leeds | 7:12.60 |
| 7 | 2 | James MASTERSON | 10 | Cheadle | 7:33.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Thomas JEPSON | 12 | Leyland Barr | 6:40.00 |
| 1 | 11 | Isaac FOY | 13 | Co Leeds | 6:31.90 |
| 2 | 13 | Oscar O'DONNELL | 9 | Co Leeds | 6:20.00 |
| 3 | 15 | Patrick O'HARA | 11 | Co Leeds | 5:55.90 |
| 4 | 17 | Zach PIERCY | 11 | Co Leeds | 5:49.00 |
| 5 | 16 | Max MOTTRAM | 13 | Cheadle | 5:55.43 |
| 6 | 14 | Jackson CLARKE | 11 | Co Leeds | 5:57.20 |
| 7 | 12 | Halo BENTLEY-HICKS | 10 | Co Leeds | 6:20.10 |
| 8 | 10 | Matei STOICESCU | 11 | Co Leeds | 6:34.00 |
| 9 | 8 | Rhys POWNALL | 12 | Leyland Barr | 6:40.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | William GRUNDY | 12 | Bolton Metro | 5:43.30 |
| 1 | 21 | Mason STOCKS | 12 | Aquabears | 5:41.30 |
| 2 | 23 | Ewan WEAVER | 15 | Aquabears | 5:38.86 |
| 3 | 25 | Owen CARMODY | 11 | Co Leeds | 5:34.90 |
| 4 | 27 | Will JARVIS | 11 | Bolton Metro | 5:30.54 |
| 5 | 26 | William WILSON | 11 | Co Leeds | 5:31.12 |
| 6 | 24 | Zachary HELM | 12 | Co Leeds | 5:35.30 |
| 7 | 22 | Mateo MARINOV | 12 | Stocksbridge | 5:40.40 |
| 8 | 20 | Alfie YOUNG | 12 | Co Leeds | 5:42.50 |
| 9 | 18 | James THOMSON | 12 | Co Leeds | 5:45.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Jacob O'DONNELL | 11 | Co Leeds | 5:29.40 |
| 1 | 31 | Oliver STEELE | 14 | Co Leeds | 5:15.03 |
| 2 | 33 | Callum RAVEN | 13 | Co Leeds | 5:06.40 |
| 3 | 35 | George CARRY | 13 | Co Leeds | 5:04.70 |
| 4 | 37 | William HICKLIN | 12 | Co Leeds | 4:59.30 |
| 5 | 36 | Matthew JUST | 13 | Co Leeds | 5:01.00 |
| 6 | 34 | W MCGINLEY-KEATES | 13 | Cheadle | 5:06.30 |
| 7 | 32 | Benjamin WALKER | 14 | Stocksbridge | 5:07.80 |
| 8 | 30 | Charlie WILCOCK | 12 | Ramsbottom | 5:20.00 |
| 9 | 28 | Gordon BALLANTYNE | 13 | Leyland Barr | 5:30.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 39 | Luke DYER | 14 | Co Leeds | 4:58.10 |
| 1 | 41 | Kelsey LIU | 13 | Bolton Metro | 4:56.16 |
| 2 | 43 | Ethan WALKER | 14 | Cheadle | 4:52.80 |
| 3 | 45 | William BACON | 16 | Co Leeds | 4:51.20 |
| 4 | 47 | Joshua KEOGH | 13 | Bolton Metro | 4:49.56 |
| 5 | 46 | Samuel SUTCLIFFE | 12 | Ramsbottom | 4:50.25 |
| 6 | 44 | Joshua BURKILL | 12 | Sutton Cheam | 4:51.68 |
| 7 | 42 | Joseph HALL | 13 | Co Leeds | 4:55.30 |
| 8 | 40 | Harry SENIOR | 14 | Co Leeds | 4:57.00 |
| 9 | 38 | Matthew JAMES | 13 | Co Leeds | 4:58.90 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 49 | Jad IDRIS | 15 | Co Leeds | 4:46.80 |
| 1 | 51 | Leo TAYLOR | 15 | Leyland Barr | 4:41.94 |
| 2 | 53 | Henry FIRTH | 16 | Co Leeds | 4:40.00 |
| 3 | 55 | Tom ARKWRIGHT | 16 | Leyland Barr | 4:32.21 |
| 4 | 57 | Jordan COOLEY | 22 | Co Leeds | 4:09.77 |
| 5 | 56 | Kourosh KHODAKHAH | 14 | Co Leeds | 4:27.20 |
| 6 | 54 | George BROOKS | 14 | Co Leeds | 4:36.10 |
| 7 | 52 | Finlay WILLIAMS | 17 | Co Leeds | 4:40.37 |
| 8 | 50 | Solomon HODGSON | 15 | Co Leeds | 4:44.80 |
| 9 | 48 | Jamie BROADHURST | 15 | Co Leeds | 4:49.00 |