EVENT 201 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Reece THOMPSON | 9 | Bo Barnsley | 7:06.00 |
| 2 | 3 | Lewis LUNG | 10 | Co Leeds | 7:00.00 |
| 3 | 5 | Jacob DYER | 11 | Co Leeds | 6:47.00 |
| 4 | 7 | Matthew OGBUAGU | 11 | Co Leeds | 6:30.00 |
| 5 | 6 | Oliver MASKELL | 11 | Co Leeds | 6:35.58 |
| 6 | 4 | Thomas ALLAN | 11 | Thirsk WH | 6:59.30 |
| 7 | 2 | George KAYE | 11 | Donc Dartes | 7:04.80 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Barney HOBBS | 11 | Co Leeds | 6:30.00 |
| 1 | 11 | Jack WATERSON | 12 | Middlesboro | 6:10.00 |
| 2 | 13 | Solomon COFFEY-WILLS | 10 | Co Leeds | 5:56.66 |
| 3 | 15 | Tyler RAVEN | 10 | Co Leeds | 5:48.10 |
| 4 | 17 | Hogan LAM | 12 | Co Leeds | 5:29.10 |
| 5 | 16 | Jake REDDIVARI | 10 | Middlesboro | 5:30.40 |
| 6 | 14 | Zachary WHITTAKER | 10 | Co Leeds | 5:51.16 |
| 7 | 12 | Ted SMITH | 11 | Borocuda T | 6:09.40 |
| 8 | 10 | Oscar CALAM | 10 | Co Leeds | 6:14.18 |
| 9 | 8 | Liam LI | 9 | Co Leeds | 6:30.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Jacob NIXON | 12 | Middlesboro | 5:19.30 |
| 1 | 21 | Theo KEARSLEY | 14 | Donc Dartes | 5:12.20 |
| 2 | 23 | Jeffrey LANGE | 12 | Co Leeds | 5:05.97 |
| 3 | 25 | Oscar JACKSON | 14 | New Earswick | 5:05.70 |
| 4 | 27 | Charlie HORNE | 15 | Co Leeds | 5:03.69 |
| 5 | 26 | William LANCASHIRE | 13 | Co Leeds | 5:05.10 |
| 6 | 24 | Kareem ALTURK | 13 | Co Salford | 5:05.70 |
| 7 | 22 | Ethan REDDIVARI | 12 | Middlesboro | 5:07.20 |
| 8 | 20 | Demilade AYEMOWA | 13 | Co Leeds | 5:12.27 |
| 9 | 18 | Alexander EGGITT | 12 | Donc Dartes | 5:27.02 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Adam MOORE | 16 | Chapeltown | 4:47.85 |
| 1 | 31 | Oliver INGHAM | 15 | Co Salford | 4:46.00 |
| 2 | 33 | Mitchell RICE | 18 | Middlesboro | 4:37.30 |
| 3 | 35 | Luke DYER | 16 | Co Leeds | 4:27.10 |
| 4 | 37 | Finn RIPLEY | 16 | Middlesboro | 4:16.80 |
| 5 | 36 | Toma SAHA | 18 | Middlesboro | 4:23.20 |
| 6 | 34 | Joseph HALL | 15 | Co Leeds | 4:29.78 |
| 7 | 32 | George CARRY | 15 | Co Leeds | 4:42.20 |
| 8 | 30 | Zachary FIDAN | 13 | Teddington | 4:47.52 |
| 9 | 28 | Franklin PHILLIPS | 15 | Rushden | 5:00.40 |