EVENT 1 Men Open 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 1 | Kian Saville | 23 | S10 | Daventry | 13:30.00 |
| 4 | 3 | Reuben Tipping | 12 | | Northampton | 12:49.00 |
| 5 | 2 | Bruce Dee | 17 | S6 | Northampton | 13:26.69 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 4 | George Brotherston | 13 | | Wellingboro | 12:30.00 |
| 2 | 6 | Noah Bielby | 13 | | Kettering | 11:50.00 |
| 3 | 8 | Thomas Kelly | 16 | | Corby | 11:45.10 |
| 4 | 10 | Zachary James Fraser | 13 | | Wellingboro | 11:30.72 |
| 5 | 9 | Aidan Penney | 13 | | Wellingboro | 11:45.00 |
| 6 | 7 | Jack Webb | 12 | | Wellingboro | 11:50.00 |
| 7 | 5 | Michal Wojcik | 14 | | Northampton | 11:56.50 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 12 | Dylan Bielby | 15 | | Kettering | 11:01.54 |
| 2 | 14 | Nikita Bals | 13 | | Northampton | 10:50.00 |
| 3 | 16 | Ciaran Long | 14 | | Daventry | 10:35.00 |
| 4 | 18 | Finley Dare | 14 | | Corby | 10:28.11 |
| 5 | 17 | Oliver Horne | 14 | | Corby | 10:34.93 |
| 6 | 15 | Louis Booker | 16 | | Wellingboro | 10:43.70 |
| 7 | 13 | Edward Oscroft | 14 | | Northampton | 10:55.40 |
| 8 | 11 | Riley Woodward | 14 | | Northampton | 11:30.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 20 | Finley Emery | 14 | | Rushden | 10:15.00 |
| 2 | 22 | Euan Swanson | 15 | | Rushden | 10:10.00 |
| 3 | 24 | Laurenzio Ciolan | 13 | | Northampton | 10:00.00 |
| 4 | 26 | Noah Wrightson | 19 | | Wellingboro | 9:52.18 |
| 5 | 25 | Edun Rowe | 15 | | Northampton | 9:59.40 |
| 6 | 23 | Connor Allen | 16 | | Wellingboro | 10:06.49 |
| 7 | 21 | Jack Hurry | 14 | | Northampton | 10:13.80 |
| 8 | 19 | Thomas James | 17 | | Wellingboro | 10:21.61 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 28 | Sam Gray | 16 | | Northampton | 9:48.60 |
| 2 | 30 | Jack Bignell | 15 | | Northampton | 9:42.70 |
| 3 | 32 | Ethan Randall | 17 | | Corby | 9:30.11 |
| 4 | 34 | Benjamin Gibbons | 16 | | Northampton | 8:55.30 |
| 5 | 33 | Samuel Cooke | 17 | | Corby | 9:12.40 |
| 6 | 31 | Manav Mistry | 16 | | Northampton | 9:30.90 |
| 7 | 29 | Bobby Phillips | 18 | | Wellingboro | 9:44.65 |
| 8 | 27 | Tyler Hollyman | 16 | | Wellingboro | 9:48.61 |