EVENT 204 Men 13/15 Yrs 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Jasper Woodhead | 13 | Wellingboro | 6:07.69 |
| 4 | 4 | Noah Bielby | 13 | Kettering | 5:50.40 |
| 5 | 3 | George Brazier | 14 | Northampton | 6:01.98 |
| 6 | 1 | George Brotherston | 13 | Wellingboro | 6:11.22 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Aidan Penney | 13 | Wellingboro | 5:43.17 |
| 2 | 8 | Riley Woodward | 14 | Northampton | 5:40.56 |
| 3 | 10 | Xavier Smith | 13 | Daventry | 5:36.08 |
| 4 | 12 | Ronnie Booker | 14 | Wellingboro | 5:31.90 |
| 5 | 11 | Zachary James Fraser | 13 | Wellingboro | 5:34.66 |
| 6 | 9 | Michal Wojcik | 14 | Northampton | 5:37.20 |
| 7 | 7 | Joel Wiffen | 14 | Corby | 5:40.70 |
| 8 | 5 | Aaron Mountford | 13 | Wellingboro | 5:46.65 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | David Bielawski | 14 | Northampton | 5:28.77 |
| 2 | 16 | Nikita Bals | 13 | Northampton | 5:21.15 |
| 3 | 18 | Franklin Phillips | 15 | Nene Valley | 5:05.01 |
| 4 | 20 | Edward Oscroft | 14 | Northampton | 5:02.14 |
| 5 | 19 | Oliver Horne | 14 | Corby | 5:03.10 |
| 6 | 17 | Dylan Bielby | 15 | Kettering | 5:14.45 |
| 7 | 15 | Oliver Leak | 15 | Kettering | 5:28.75 |
| 8 | 13 | Lucas Krynauw | 14 | Wellingboro | 5:30.32 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Laurenzio Ciolan | 13 | Northampton | 4:58.41 |
| 2 | 24 | M Vasconcellos-Blanch | 15 | Nene Valley | 4:53.30 |
| 3 | 26 | Jack Bignell | 15 | Northampton | 4:40.28 |
| 4 | 28 | Edun Rowe | 15 | Northampton | 4:31.55 |
| 5 | 27 | Jack Hurry | 14 | Northampton | 4:37.21 |
| 6 | 25 | Finley Dare | 14 | Corby | 4:53.30 |
| 7 | 23 | Euan Swanson | 15 | Rushden | 4:56.80 |
| 8 | 21 | Finley Emery | 14 | Rushden | 5:00.60 |