EVENT 201 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Angus YOUNG | 10 | Co Leeds | 7:43.00 |
| 3 | 4 | Dexter GROCOCK | 9 | Co Sheffield | 7:17.00 |
| 4 | 6 | Reuben HARRISON | 11 | Co Leeds | 6:54.90 |
| 5 | 5 | Owen TEMPEST | 10 | Co Leeds | 7:00.00 |
| 6 | 3 | Noah DARNELL | 10 | Co Leeds | 7:28.70 |
| 7 | 1 | Axel ROBINSON | 11 | Co Sheffield | 7:45.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 8 | Seth JONES | 11 | Co Leeds | 6:47.90 |
| 1 | 10 | Harry AUSTIN | 10 | Bo Barnsley | 6:42.12 |
| 2 | 12 | Isaac FOY | 13 | Co Leeds | 6:32.60 |
| 3 | 14 | Halo BENTLEY-HICKS | 10 | Co Leeds | 6:20.10 |
| 4 | 16 | Theo SMITH | 11 | Cleethorpes | 6:20.00 |
| 5 | 15 | Seth CHARLESWORTH | 10 | Co Sheffield | 6:20.00 |
| 6 | 13 | Matei STOICESCU | 12 | Co Leeds | 6:30.41 |
| 7 | 11 | Oliver BARRETT | 10 | Co Leeds | 6:35.40 |
| 8 | 9 | Hudson SMITH | 10 | Co Leeds | 6:45.00 |
| 9 | 7 | Samuel HILL | 12 | Co Leeds | 6:52.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 18 | Ernesto GARCIA | 10 | Co Sheffield | 6:10.00 |
| 1 | 20 | Adam GILL | 12 | Bo Barnsley | 6:09.80 |
| 2 | 22 | Connor SHERING | 12 | Co Sheffield | 6:00.00 |
| 3 | 24 | Gethin SINCLAIR | 12 | Co Sheffield | 6:00.00 |
| 4 | 26 | Jenson STILLING | 10 | Co Sheffield | 6:00.00 |
| 5 | 25 | George ROBERTSON | 10 | Co Sheffield | 6:00.00 |
| 6 | 23 | Koby ORD | 13 | Rotherham Mo | 6:00.00 |
| 7 | 21 | Elliott MAYERS | 10 | Co Sheffield | 6:00.00 |
| 8 | 19 | William WEBSTER | 9 | Co Sheffield | 6:10.00 |
| 9 | 17 | Oliver KEENS | 12 | Rotherham Mo | 6:15.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 28 | Archie SKINNER | 11 | Co Sheffield | 5:55.00 |
| 1 | 30 | Nicholas LEONE | 12 | Rotherham Mo | 5:50.00 |
| 2 | 32 | Zach CROWTHER | 13 | Co Leeds | 5:47.26 |
| 3 | 34 | Harry WHITFIELD | 11 | Darlington | 5:44.98 |
| 4 | 36 | Samuel JACKSON | 13 | Spenborough | 5:36.90 |
| 5 | 35 | Ethan COWELL | 12 | Co Leeds | 5:42.03 |
| 6 | 33 | James THOMSON | 12 | Co Leeds | 5:45.50 |
| 7 | 31 | James ASPINALL | 10 | Co Sheffield | 5:50.00 |
| 8 | 29 | Oliver STEELE | 14 | Co Leeds | 5:50.50 |
| 9 | 27 | Lewis WARREN | 11 | Co Sheffield | 6:00.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 38 | Charlie HASLINGDEN | 10 | Co Sheffield | 5:35.00 |
| 1 | 40 | Matthew MENZER | 14 | Co Wakefield | 5:32.70 |
| 2 | 42 | Joshua BOOTH | 13 | Rotherham Mo | 5:13.60 |
| 3 | 44 | Ethan ROCHESTER | 15 | Co Sheffield | 4:58.00 |
| 4 | 46 | Harry SENIOR | 15 | Co Leeds | 4:57.00 |
| 5 | 45 | James RYALL | 15 | Co Sheffield | 4:58.00 |
| 6 | 43 | Oliver AUSTIN | 13 | Bo Barnsley | 5:13.46 |
| 7 | 41 | Owen CARMODY | 11 | Co Leeds | 5:27.00 |
| 8 | 39 | Louis BELL | 13 | Co Sheffield | 5:35.00 |
| 9 | 37 | Zachary HELM | 12 | Co Leeds | 5:35.30 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 48 | Daniel CLIPSHAM | 15 | Co Wakefield | 4:48.60 |
| 1 | 50 | Daniel JACKSON | 15 | Spenborough | 4:44.80 |
| 2 | 52 | Maximus MURRAY | 14 | Gates &Whick | 4:35.90 |
| 3 | 54 | Daniel MENZER | 18 | Bo Barnsley | 4:29.10 |
| 4 | 56 | Luke BOOTH | 16 | Rotherham Mo | 4:15.00 |
| 5 | 55 | Noah WRAGG | 18 | Bo Barnsley | 4:27.30 |
| 6 | 53 | Cameron RHODES | 16 | Rotherham Mo | 4:31.00 |
| 7 | 51 | Oscar TAYLOR | 16 | Cleethorpes | 4:40.00 |
| 8 | 49 | Alex BOYER | 14 | Darlington | 4:48.44 |
| 9 | 47 | Maxwell FORD | 13 | Co Leeds | 4:51.20 |