EVENT 401 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Daniel GUIMARAES | 11 | Team Luton | |
| 3 | 4 | George STAMP | 12 | Linslade | |
| 4 | 6 | Luke GRIFFIN | 13 | Linslade | |
| 5 | 5 | Dewi FORDYCE | 11 | Berkhamsted | |
| 6 | 3 | Cem ADALI | 15 | Verulam | |
| 7 | 1 | Andrei GHEORGHE | 12 | Newport Pag | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Tom GILBERT | 12 | Watford SC | 6:48.80 |
| 2 | 10 | Noah PRESTON | 12 | TigersJersey | 6:21.90 |
| 3 | 12 | Casper WHITTAKER | 11 | Biggleswade | 6:12.28 |
| 4 | 14 | Jack BARNARD | 18 | Watford SC | 4:52.60 |
| 5 | 13 | George SAUNDERS | 14 | Team Luton | 5:24.70 |
| 6 | 11 | Zente BUZSIK | 13 | Haringey | 6:15.30 |
| 7 | 9 | Aaron RAWNSLEY | 12 | Harpenden | 6:30.60 |
| 8 | 7 | Henry CHALONER | 12 | Biggleswade | |