EVENT 304 Men MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 1 | 1 | Alexander HOBBS | 05 | S7 | Mt Kelly | 6:44.98 |
| 2 | 2 | Bruce DEE | 06 | S6 | Northampton | 6:29.14 |
| 3 | 3 | Theo WOODEN | 09 | | Crawley | 6:23.65 |
| 4 | 4 | Akaash DAS | 08 | S8 | Oswestry Ott | 6:20.61 |
| 5 | 5 | Sebastian WILLIAMS | 04 | S6 | Mt Kelly | 6:05.77 |
| 6 | 6 | Jacob WOOD | 06 | S9 | Gloucester | 5:47.47 |
| 7 | 7 | Nathan BROWN | 05 | S10 | Driffield | 5:46.29 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 0 | 8 | Owen SAY | 01 | S8 | Nova Cent'n | 5:29.26 |
| 1 | 9 | Matthew DAVIES | 04 | S9 | RomseyTotton | 5:28.30 |
| 2 | 10 | Ethan NAISBITT | 03 | S9 | Co Manch Aq | 5:25.71 |
| 3 | 11 | Benny ROMBERG | 06 | S10 | Kingston Roy | 5:22.64 |
| 4 | 12 | Luke BOYLES | 04 | S12 | Bourmth Coll | 5:19.72 |
| 5 | 13 | Sam DOWNIE | 06 | S8 | GBR - UELX | 5:10.21 |
| 6 | 14 | Felix COWAN | 02 | S8 | Canada | 5:09.29 |
| 7 | 15 | Luke BATTY | 05 | S9 | GBR - BTMN | 5:06.00 |
| 8 | 16 | Balthazar BRADSHAW | 06 | S10 | Brompton | 4:52.22 |
| 9 | 17 | Zack STURGESS | 07 | S10 | S Bournem'th | 4:51.28 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Cat | Club | Time |
| 0 | 18 | Zach ZONA | 98 | S8 | Canada | 4:49.09 |
| 1 | 19 | Jan SCHREIBER | 01 | S10 | Germany | 4:48.26 |
| 2 | 20 | Michael JONES | 94 | S7 | GBR - MANN | 4:48.04 |
| 3 | 21 | Laurin Matti WALTHER | 03 | S9 | Germany | 4:46.12 |
| 4 | 22 | Inigo LLOPIS SANZ | 98 | S8 | Spain | 4:41.16 |
| 5 | 23 | Benjamin GRAINGER | 03 | S10 | GBR - PEEN | 4:39.95 |
| 6 | 24 | Kieran WILLIAMS | 04 | S10 | GBR - NEQW | 4:36.49 |
| 7 | 25 | Barry MCCLEMENTS | 01 | S9 | Ireland | 4:27.11 |
| 8 | 26 | Oliver CARTER | 00 | S10 | GBR - WUSX | 4:19.21 |
| 9 | 27 | Justin KAPS | 01 | S10 | Germany | 4:15.85 |