EVENT 416 Open/Male 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | George KING | 13 | Co Leeds | 10:34.01 |
| 3 | 4 | Dylan GREGORY | 14 | Co Liverpool | 10:02.31 |
| 4 | 6 | William BREARTON | 14 | Wirral Metro | 9:56.70 |
| 5 | 5 | Theo CADAMY | 14 | Newcastle | 10:01.09 |
| 6 | 3 | Ethan DWYER | 13 | Co Liverpool | 10:03.40 |
| 7 | 1 | Benjamin PISCOPO | 12 | Co Peterboro | 10:37.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 8 | Dante PALMER | 13 | Nova Cent'n | 9:49.42 |
| 1 | 10 | Archie HONEY | 14 | Blackpool Aq | 9:43.20 |
| 2 | 12 | Ewan PEARCE | 17 | Nuneaton | 9:34.88 |
| 3 | 14 | Gabriel BARNETT | 14 | Blackpool Aq | 9:32.40 |
| 4 | 16 | Micah-Noel SCHRANK | 17 | Co Manch Aq | 9:30.20 |
| 5 | 15 | Daniel BARTON | 15 | Wigan BEST | 9:31.82 |
| 6 | 13 | Daniel TEW | 14 | York City | 9:33.70 |
| 7 | 11 | Luke DYE | 16 | Nova Cent'n | 9:38.00 |
| 8 | 9 | Cole REID | 18 | Newcastle | 9:45.00 |
| 9 | 7 | Lucas ROBSON | 14 | Rotherham Mo | 9:55.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 19 | Callum BYRNE | 15 | Southport | 9:20.57 |
| 1 | 21 | Finlay GODDEN | 15 | Nuneaton | 9:17.72 |
| 2 | 23 | Rafael PASSOS | 16 | Nuneaton | 9:16.20 |
| 3 | 25 | Oliver INGHAM | 17 | Co Salford | 9:15.04 |
| 4 | 27 | Finn PROUD | 16 | Newcastle | 9:04.40 |
| 5 | 26 | Mark OWEN | 16 | Bolton | 9:09.44 |
| 6 | 24 | Matthew JAMES | 17 | Co Leeds | 9:15.89 |
| 7 | 22 | Owen BROWN | 16 | Newcastle | 9:16.67 |
| 8 | 20 | Finlay BYRNE | 14 | Southport | 9:20.41 |
| 9 | 17 | C BUTTERELL-QUANBROUGH | 15 | Bassetlaw SS | 9:26.70 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 29 | Arthur OWENS | 16 | Co Leeds | 9:00.80 |
| 1 | 31 | William WILSON | 15 | Co Leeds | 8:57.52 |
| 2 | 33 | Zac BAUGHAN-WITHINGTON | 15 | KingstonHull | 8:51.30 |
| 3 | 35 | Thomas CHITTOCK | 18 | Bo Waltham F | 8:45.50 |
| 4 | 37 | Alexander TEW | 16 | York City | 8:40.80 |
| 5 | 36 | Patrick NEILL | 17 | Co Leeds | 8:42.70 |
| 6 | 34 | Theo BRUNTLETT | 16 | Nuneaton | 8:50.40 |
| 7 | 32 | Luke DYER | 18 | Co Leeds | 8:53.80 |
| 8 | 30 | Josh DRURY-TEW | 16 | Co Birm'ham | 8:57.69 |
| 9 | 28 | Carlos SIERRA VILLEGAS | 17 | Chesterfield | 9:01.80 |