EVENT 624 Open/Male 16 /Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Callum Platt | 17 | Brackley SC | 5:31.50 |
| 2 | 4 | George Brotherston | 16 | Wellingboro | 5:17.10 |
| 3 | 6 | Matthew Kemp | 16 | Wellingboro | 4:58.10 |
| 4 | 8 | Aaron Mountford | 16 | Wellingboro | 4:53.20 |
| 5 | 7 | Alexandru Ierina | 16 | Corby | 4:53.70 |
| 6 | 5 | Jamie Mason | 17 | Corby | 5:13.10 |
| 7 | 3 | Jesunefe Abeke | 16 | Corby | 5:22.40 |
| 8 | 1 | Dorian Marafko | 16 | Corby | 5:39.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Oliver Horne | 17 | Corby | 4:43.30 |
| 2 | 12 | Oliver Dovey | 16 | Corby | 4:38.70 |
| 3 | 14 | Wojciech Walach | 16 | Corby | 4:34.30 |
| 4 | 16 | David Bielawski | 17 | Northampton | 4:28.90 |
| 5 | 15 | Zachary Jones | 17 | Northampton | 4:30.21 |
| 6 | 13 | Daniel Doyle | 18 | Kettering | 4:34.80 |
| 7 | 11 | Edward Oscroft | 17 | Northampton | 4:41.80 |
| 8 | 9 | Kristians Kupcovs | 17 | Daventry | 4:49.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Jack Hurry | 17 | Northampton | 4:25.88 |
| 2 | 20 | Finley Dare | 17 | Corby | 4:18.80 |
| 3 | 22 | Jack Bignell | 18 | Northampton | 4:10.90 |
| 4 | 24 | Sam Brylka | 17 | Corby | 4:06.40 |
| 5 | 23 | Edun Rowe | 18 | Northampton | 4:06.80 |
| 6 | 21 | Laurenzio Ciolan | 16 | Corby | 4:16.90 |
| 7 | 19 | Connor Allen | 19 | Wellingboro | 4:22.20 |
| 8 | 17 | Riley Woodward | 17 | Northampton | 4:27.80 |