EVENT 102 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Louis Pell | 13 | Northampton | 6:45.67 |
| 4 | 3 | James Oscroft | 11 | Northampton | 6:30.70 |
| 5 | 2 | Oscar Williscroft | 14 | Long Eaton | 6:45.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | George Howard | 12 | Co Leicester | 6:00.00 |
| 3 | 7 | Archie Pettinger | 14 | Worksop | 5:41.29 |
| 4 | 9 | Maxwell Burdett | 12 | Co Leicester | 5:33.12 |
| 5 | 8 | Kais Alhijazi | 13 | Co Leicester | 5:35.51 |
| 6 | 6 | Jacson Crabb | 13 | Co Leicester | 5:45.00 |
| 7 | 4 | Mason Traynor | 11 | Co Leicester | 6:05.96 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Freddie Burdett | 14 | Co Leicester | 5:25.94 |
| 2 | 13 | Raymond Dalby-Rose | 14 | Worksop | 5:24.78 |
| 3 | 15 | Connor Rickard | 16 | March | 5:16.37 |
| 4 | 17 | Lewis Fitch | 17 | Co Leicester | 5:02.80 |
| 5 | 16 | Oliver Davies | 15 | Co Leicester | 5:14.70 |
| 6 | 14 | William Oxley | 14 | Co Leicester | 5:22.57 |
| 7 | 12 | Emerson-Blu Gupwell | 14 | Co Leicester | 5:24.97 |
| 8 | 10 | David Bielawski | 15 | Northampton | 5:32.67 |