EVENT 624 Men 16 Yrs/Over 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 3 | 1 | Kian Saville | 23 | S10 | Daventry | 6:36.51 |
| 4 | 3 | Theo Woollams | 16 | | Corby | 5:25.30 |
| 5 | 2 | Bruce Dee | 17 | S6 | Northampton | 5:52.84 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 4 | Conner Munden | 16 | | Northampton | 5:02.94 |
| 2 | 6 | Louis Booker | 16 | | Wellingboro | 4:58.74 |
| 3 | 8 | Thomas James | 17 | | Wellingboro | 4:53.27 |
| 4 | 10 | Tyler Hollyman | 16 | | Wellingboro | 4:35.91 |
| 5 | 9 | Noah Wrightson | 19 | | Wellingboro | 4:40.01 |
| 6 | 7 | Joseph Greaves | 16 | | Corby | 4:58.10 |
| 7 | 5 | Matthew Taylor | 16 | | Northampton | 4:59.77 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 12 | Ruben Snelson | 18 | | Daventry | 4:33.62 |
| 2 | 14 | Manav Mistry | 16 | | Northampton | 4:29.31 |
| 3 | 16 | Elliott Barker | 16 | | Northampton | 4:24.70 |
| 4 | 18 | Benjamin Gibbons | 16 | | Northampton | 4:17.85 |
| 5 | 17 | Samuel Cooke | 17 | | Corby | 4:20.40 |
| 6 | 15 | Sam Gray | 16 | | Northampton | 4:27.72 |
| 7 | 13 | Bobby Phillips | 18 | | Wellingboro | 4:32.42 |
| 8 | 11 | Skip Snelson | 21 | | Daventry | 4:33.80 |