EVENT 201 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Harry DAFFERN | 12 | Leic Sharks | 7:00.00 |
| 2 | 4 | Austin GRAHAM | 12 | Co Leicester | 6:20.90 |
| 3 | 6 | Ali JAMILI | 12 | Co Leicester | 6:00.65 |
| 4 | 8 | Yan Han TAN | 15 | Newport Pag | 5:42.60 |
| 5 | 7 | Kristians KUPCOVS | 15 | Daventry | 5:52.40 |
| 6 | 5 | Zachary FRASER | 14 | Wellingboro | 6:17.80 |
| 7 | 3 | Ted MARSHALL | 11 | Leic Sharks | 6:26.80 |
| 8 | 1 | Eric BUTANS | 13 | Corby | 7:05.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Maxwell BURDETT | 12 | Co Leicester | 5:38.40 |
| 2 | 12 | Emerson-Blu GUPWELL | 14 | Co Leicester | 5:30.30 |
| 3 | 14 | Julian CASEY | 18 | Hinckley | 5:22.60 |
| 4 | 16 | Ethan RANDALL | 18 | Corby | 5:17.36 |
| 5 | 15 | Euan SWANSON | 16 | Rushden | 5:20.60 |
| 6 | 13 | Cole ANGELL | 16 | Kettering | 5:30.00 |
| 7 | 11 | Finley EMERY | 15 | Rushden | 5:31.95 |
| 8 | 9 | Kais ALHIJAZI | 13 | Co Leicester | 5:40.70 |