EVENT 301 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Benjamin CHAMBERLAIN | 11 | Wellingboro | 8:30.00 |
| 3 | 3 | Alastair CROSS | 14 | Melton M'bry | 6:43.01 |
| 4 | 5 | Henry RAITT | 11 | Corby | 6:29.90 |
| 5 | 4 | Julius BERISHA | 12 | Wellingboro | 6:39.46 |
| 6 | 2 | Spencer CROSS | 10 | Melton M'bry | 6:49.28 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Theo VANDOROS | 12 | Melton M'bry | 6:14.39 |
| 2 | 9 | Gregory CROSS | 11 | Melton M'bry | 5:57.18 |
| 3 | 11 | Mohamed JERID | 13 | Rushden | 5:49.50 |
| 4 | 13 | Jamie MASON | 15 | Corby | 5:36.01 |
| 5 | 12 | Jesunefe ABEKE | 15 | Corby | 5:36.95 |
| 6 | 10 | Dorian MARAFKO | 15 | Corby | 5:55.47 |
| 7 | 8 | Zak BATES | 12 | Melton M'bry | 5:58.71 |
| 8 | 6 | William STEVENSON | 11 | Nene Valley | 6:15.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Oscar PAWLOWSKI | 10 | Corby | 5:31.01 |
| 2 | 17 | Oliver TRENWITH | 12 | Corby | 5:19.30 |
| 3 | 19 | Jacob LITTLEWOOD | 14 | Market Har | 5:10.94 |
| 4 | 21 | Michael FRASER | 13 | Hinckley | 5:01.73 |
| 5 | 20 | Benjamin WHITE | 14 | Rushden | 5:07.60 |
| 6 | 18 | Oliver WICKINS | 15 | Market Har | 5:18.00 |
| 7 | 16 | Cameron HUGHES | 13 | Wellingboro | 5:29.51 |
| 8 | 14 | Matthew KEMP | 15 | Wellingboro | 5:32.60 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Kristians KUPCOVS | 15 | Daventry | 4:44.69 |
| 2 | 25 | Daniel MUSTATA | 14 | Corby | 4:41.30 |
| 3 | 27 | Wojciech WALACH | 14 | Corby | 4:37.40 |
| 4 | 29 | Tyler HOLLYMAN | 18 | Corby | 4:10.20 |
| 5 | 28 | Connor ALLEN | 18 | Wellingboro | 4:26.83 |
| 6 | 26 | Aryan NATH | 16 | Corby | 4:38.40 |
| 7 | 24 | Oliver HORNE | 16 | Corby | 4:42.83 |
| 8 | 22 | Ronnie BOOKER | 16 | Wellingboro | 4:51.79 |