EVENT 303 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 7 | Luke Batty | 12 | S9 | Bolton Metro | 5:50.11 |
| 3 | 11 | Dominic Redpath | 15 | S9 | Gosport | 5:17.97 |
| 4 | 15 | Craig McNeil | 20 | S10 | Co Salford | 4:49.29 |
| 5 | 13 | Kieran Williams | 13 | S10 | Newquay | 5:08.52 |
| 6 | 9 | Reilly Shanahan | 17 | S9 | Shrewsbury | 5:22.93 |
| 7 | 5 | Maximilian Tulloch | 12 | S9 | Chalfont | 6:00.73 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 0 | 2 | Samuel Whearty | 15 | S9 | Colchester | 6:27.10 |
| 1 | 4 | Alexander Taylor | 16 | S10 | Harrogate | 6:14.88 |
| 2 | 8 | Matthew Clowes | 18 | S8 | Caradon | 5:23.84 |
| 3 | 12 | Adam Whyborne | 16 | S10 | Billingham | 5:10.50 |
| 4 | 16 | Callum Pearson | 21 | S10 | Hastings | 4:34.11 |
| 5 | 14 | Benjamin Grainger | 14 | S10 | Io Man | 4:56.31 |
| 6 | 10 | James Brown | 15 | S9 | Bilston | 5:18.88 |
| 7 | 6 | Finlay Middleton | 15 | S8 | Mt Kelly | 5:51.23 |
| 8 | 3 | Leo McCrea | 14 | S6 | Bourmth Coll | 6:20.79 |
| 9 | 1 | Alexander Hobbs | 12 | S7 | Mt Kelly | 7:44.51 |