EVENT 201 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 2 | Oliver BARKER | 9 | | Co Leeds | 6:45.00 |
| 2 | 4 | Jake REDDIVARI | 9 | | Middlesboro | 6:30.00 |
| 3 | 6 | Max CLARK | 11 | | Co Leeds | 6:22.37 |
| 4 | 8 | Christopher GOODWIN | 11 | | Chapeltown | 6:15.00 |
| 5 | 7 | Joshua GUY | 12 | | Bo Barnsley | 6:17.50 |
| 6 | 5 | Leo LI | 10 | | Co Leeds | 6:30.00 |
| 7 | 3 | Harry DIXON | 9 | | Co Leeds | 6:30.00 |
| 8 | 1 | Ellis HARGREAVES | 10 | | Co Leeds | 6:46.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 10 | Hogan LAM | 11 | | Co Leeds | 6:11.30 |
| 1 | 12 | Sebastian HUNTER | 12 | | Co Leeds | 5:54.90 |
| 2 | 14 | William CHADAWAY | 13 | | Borocuda T | 5:49.20 |
| 3 | 16 | Codrin CATANA | 13 | | Borocuda T | 5:43.90 |
| 4 | 18 | Ethan GARSIDE | 14 | | Co Wakefield | 5:30.00 |
| 5 | 17 | Noah BURDEN | 14 | S9 | Satellite | 5:38.24 |
| 6 | 15 | Oscar O'DONNELL | 11 | | Co Leeds | 5:44.18 |
| 7 | 13 | Adam GILL | 13 | | Bo Barnsley | 5:53.40 |
| 8 | 11 | Owen TEMPEST | 11 | | Co Leeds | 6:06.21 |
| 9 | 9 | Alfie CRAGGS | 11 | | Co Leeds | 6:11.70 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 20 | Reuben HARRISON | 12 | | Co Leeds | 5:24.91 |
| 1 | 22 | Jacob O'DONNELL | 12 | | Co Leeds | 5:14.75 |
| 2 | 24 | Joshua YOUNG | 14 | | Middlesboro | 5:09.10 |
| 3 | 26 | Elliot ROBERTS-CUTTS | 14 | | Chapeltown | 5:08.37 |
| 4 | 28 | Thomas BIDGOOD | 13 | | Satellite | 5:05.60 |
| 5 | 27 | Mateo MARINOV | 13 | | Stocksbridge | 5:07.80 |
| 6 | 25 | Owen CARMODY | 12 | | Co Leeds | 5:08.56 |
| 7 | 23 | Matthew ROBERTS | 16 | | Co Leeds | 5:10.00 |
| 8 | 21 | Daniel HAWKINS | 13 | | Harrogate | 5:24.07 |
| 9 | 19 | Ethan GRIFFIN | 14 | | Satellite | 5:26.90 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 30 | Callum RAVEN | 14 | | Co Leeds | 4:56.26 |
| 1 | 32 | Hayden LAM | 12 | | Co Leeds | 4:53.50 |
| 2 | 34 | Maxwell FORD | 14 | | Co Leeds | 4:44.97 |
| 3 | 36 | Simon HARRISON | 14 | | Satellite | 4:29.00 |
| 4 | 38 | Finn RIPLEY | 15 | | Middlesboro | 4:20.80 |
| 5 | 37 | Alastair JEFFREY | 17 | | Satellite | 4:25.00 |
| 6 | 35 | Toma SAHA | 17 | | Middlesboro | 4:29.50 |
| 7 | 33 | Luke DYER | 15 | | Co Leeds | 4:52.10 |
| 8 | 31 | Adam MOORE | 15 | | Chapeltown | 4:55.00 |
| 9 | 29 | George DENHAM-EVERETT | 15 | | Satellite | 4:56.70 |