EVENT 503 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 4 | Benjamin Grainger | 12 | S10 | Io Man | 6:01.18 |
| 3 | 8 | Tom Piggott | 15 | S10 | Shrewsbury | 5:10.61 |
| 4 | 12 | Jaxon Simmons | 15 | S13 | Co Peterboro | 4:42.09 |
| 5 | 10 | Callum Pearson | 19 | S10 | Hastings | 4:53.24 |
| 6 | 6 | Daniel Bennett | 19 | S8 | Gloucester | 5:34.43 |
| 7 | 2 | Dominic Redpath | 13 | S9 | Gosport | 6:22.88 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 1 | Matthew Harding | 16 | S6 | Wirral Metro | 6:23.05 |
| 2 | 5 | Reilly Shanahan | 15 | S9 | Shrewsbury | 5:56.20 |
| 3 | 9 | Arthur Morley | 16 | S9 | Fareham N'ds | 5:04.82 |
| 4 | 13 | Craig McNeil | 18 | S10 | SwimTrafford | 4:42.07 |
| 5 | 11 | Oliver Carter | 15 | S10 | Cupar | 4:43.44 |
| 6 | 7 | Matthew Rishworth | 13 | S10 | Staines | 5:31.63 |
| 7 | 3 | Finlay Middleton | 13 | S8 | Stowmarket | 6:10.06 |