EVENT 201 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 2 | 18 | George LONGLEY | 16 | S6 | Carnforth | 6:46.50 |
| 3 | 2 | Dante PALMER | 13 | | Nova Cent'n | 4:46.14 |
| 4 | 4 | Oscar FOCHT | 13 | | KingstonHull | 4:45.40 |
| 5 | 3 | Leo LI | 13 | | Co Leeds | 4:45.98 |
| 6 | 1 | Ethan DWYER | 13 | | Co Liverpool | 4:50.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 6 | Harry AUSTIN | 14 | | Bo Barnsley | 4:41.80 |
| 1 | 8 | Gabriel BARNETT | 14 | | Blackpool Aq | 4:40.45 |
| 2 | 10 | Jeffrey LANGE | 14 | | Co Leeds | 4:38.99 |
| 3 | 12 | George HARRISON | 14 | | KingstonHull | 4:38.05 |
| 4 | 14 | Finlay BYRNE | 14 | | Southport | 4:36.24 |
| 5 | 13 | James GRAHAM | 14 | | Co Liverpool | 4:36.56 |
| 6 | 11 | Edward GREGORY | 13 | | Nova Cent'n | 4:38.33 |
| 7 | 9 | Noah DARNELL | 14 | | Co Leeds | 4:39.77 |
| 8 | 7 | Benji SUTCLIFFE | 14 | | Ramsbottom | 4:40.51 |
| 9 | 5 | Oscar O'DONNELL | 13 | | Co Leeds | 4:42.98 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 17 | Harry WILLIS | 14 | | Newcastle | 4:26.30 |
| 1 | 22 | Samuel GREEN | 15 | | Bassetlaw SS | 4:20.60 |
| 2 | 26 | William WILSON | 15 | | Co Leeds | 4:18.87 |
| 3 | 30 | Kaiden HITCHINS | 15 | | Co Birm'ham | 4:16.40 |
| 4 | 35 | Alexander TEW | 16 | | York City | 4:12.20 |
| 5 | 32 | Dominic WORKMAN | 16 | | Co Liverpool | 4:14.79 |
| 6 | 29 | George TURNER | 18 | | Newcastle | 4:16.80 |
| 7 | 24 | Zac BAUGHAN-WITHINGTON | 15 | | KingstonHull | 4:19.84 |
| 8 | 20 | Finn PROUD | 16 | | Newcastle | 4:21.59 |
| 9 | 15 | Lewis HALL | 14 | | KingstonHull | 4:34.23 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 19 | Layton BROWN | 17 | | Nuneaton | 4:21.90 |
| 1 | 23 | Kian LEE | 17 | | Co Peterboro | 4:20.40 |
| 2 | 27 | Lucas CHRISTIE | 15 | | KingstonHull | 4:18.10 |
| 3 | 31 | Josh DRURY-TEW | 16 | | Co Birm'ham | 4:16.01 |
| 4 | 36 | Dominic SIMPSON | 19 | | Nuneaton | 4:10.20 |
| 5 | 34 | Patrick NEILL | 17 | | Co Leeds | 4:12.21 |
| 6 | 28 | Layne KEYWORTH | 17 | | Bassetlaw SS | 4:16.80 |
| 7 | 25 | Theo BRUNTLETT | 16 | | Nuneaton | 4:19.30 |
| 8 | 21 | Luke DYER | 18 | | Co Leeds | 4:20.80 |
| 9 | 16 | Daniel TEW | 14 | | York City | 4:33.80 |