EVENT 401 Open/Male 12 /Over 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 1 | Casey COSTAIN | 13 | Wirral Metro | 10:32.20 |
| 1 | 3 | Dexter WOODWARD | 15 | Co Bradford | 10:14.00 |
| 2 | 5 | William KITE | 15 | Louth | 9:57.10 |
| 3 | 7 | Ewan LEONARD | 15 | Conwy | 9:51.85 |
| 4 | 9 | Carlos ALVAREZ ODELL | 16 | York City | 9:41.07 |
| 5 | 8 | James THOMSON | 15 | Co Leeds | 9:50.81 |
| 6 | 6 | Jacob O'DONNELL | 14 | Co Leeds | 9:57.04 |
| 7 | 4 | Aidan WILSON | 15 | Conwy | 10:00.56 |
| 8 | 2 | William BREARTON | 13 | Wirral Metro | 10:19.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 11 | Daniel ROCHE | 15 | Leamington | 9:39.17 |
| 1 | 13 | Hayden LAM | 14 | Co Leeds | 9:32.20 |
| 2 | 15 | Theo SWANN | 14 | Rotherham Mo | 9:29.10 |
| 3 | 18 | Oliver LAMBERT | 15 | Co Liverpool | 9:21.52 |
| 4 | 21 | Ieuan EVANS | 17 | Conwy | 9:19.25 |
| 5 | 20 | Matthew SAWERS | 15 | Wigan BEST | 9:20.21 |
| 6 | 16 | Dominic WORKMAN | 15 | Co Liverpool | 9:26.97 |
| 7 | 14 | Daniel BARTON | 14 | Wigan BEST | 9:31.82 |
| 8 | 12 | Zachary FIDAN | 14 | York City | 9:33.88 |
| 9 | 10 | Owen CARMODY | 14 | Co Leeds | 9:40.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 24 | Luke DYER | 17 | Co Leeds | 9:09.09 |
| 1 | 26 | Joseph HALL | 16 | Co Leeds | 9:07.74 |
| 2 | 27 | Thomas CHITTOCK | 17 | Bo Waltham F | 8:57.95 |
| 3 | 29 | Ethan POTTER | 16 | Co Sheffield | 8:43.00 |
| 4 | 30 | George DAINTITH | 16 | Co Liverpool | 8:30.60 |
| 5 | 31 | Joseph ASHLEY | 16 | Co Liverpool | 8:40.80 |
| 6 | 28 | Jack PRITCHARD | 17 | Wigan BEST | 8:55.10 |
| 7 | 32 | Thomas EARDLEY | 17 | RichmondDale | 8:59.17 |
| 8 | 25 | Oscar GAVELLE | 15 | Rotherham Mo | 9:08.80 |
| 9 | 23 | Arthur OWENS | 15 | Co Leeds | 9:10.50 |