EVENT 405 Men Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Paul Page | 15 | Co Leicester | 4:58.10 |
| 2 | 4 | Archie Dandy | 14 | Co Leicester | 4:52.90 |
| 3 | 6 | Daniel Walker | 15 | Nova Cent'n | 4:49.20 |
| 4 | 8 | James Dobney | 18 | Grantham | 4:48.43 |
| 5 | 7 | Archie Neaves | 17 | Co Leicester | 4:48.70 |
| 6 | 5 | James Lake | 15 | Loughborough | 4:51.32 |
| 7 | 3 | Harrison Clarke | 14 | Nova Cent'n | 4:53.50 |
| 8 | 1 | Cole Stevens | 15 | Chesterfield | 5:02.12 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Findlay Cordle | 15 | Repton | 4:44.60 |
| 2 | 12 | Jacob Whibley | 17 | Repton | 4:33.24 |
| 3 | 14 | Oscar Dodds | 16 | Co Leicester | 4:29.80 |
| 4 | 16 | Finley Bunhejee | 17 | Derventio | 4:22.41 |
| 5 | 15 | Daniel Kennedy | 18 | Repton | 4:23.56 |
| 6 | 13 | Luke Jeal | 19 | Nova Cent'n | 4:29.84 |
| 7 | 11 | Elliot Sibley | 17 | Nova Cent'n | 4:38.28 |
| 8 | 9 | Luke Stevens | 16 | Co Leicester | 4:45.30 |