EVENT 101 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Rafe LAWSON | 12 | Berkhamsted | |
| 4 | 23 | Samuel CHILDS | 11 | Berkhamsted | 8:00.00 |
| 5 | 3 | George HEARN | 14 | Dunstable | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Jack CANHAM | 13 | Team Luton | 6:39.17 |
| 2 | 7 | Euan DEVINE | 13 | Bedford SS | 6:19.00 |
| 3 | 9 | Solomon DENT | 15 | Bedford SS | 6:04.97 |
| 4 | 11 | Jesse KEEN | 15 | Amersham | 5:55.32 |
| 5 | 10 | Zoran BUTORAC | 13 | Camden Swiss | 5:59.23 |
| 6 | 8 | Daniel DALY | 13 | Camden Swiss | 6:18.10 |
| 7 | 6 | Ian ILIEV | 13 | Camden Swiss | 6:20.00 |
| 8 | 4 | Daniel GUIMARAES | 11 | Team Luton | 7:30.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Luc BONFIGLIO | 13 | Camden Swiss | 5:35.40 |
| 2 | 16 | Finn MATHERS | 13 | Camden Swiss | 5:26.00 |
| 3 | 19 | Rafi GIBSON | 16 | Aylesbury | 5:07.30 |
| 4 | 21 | Ryan CLOSE | 16 | Bedford SS | 5:00.00 |
| 5 | 20 | Leonardo DIALLO | 15 | Camden Swiss | 5:03.20 |
| 6 | 17 | Henry GILLAM | 14 | Camden Swiss | 5:13.90 |
| 7 | 15 | Daniel TALBOT | 14 | Aylesbury | 5:33.88 |
| 8 | 12 | Oliver GIRVAN | 17 | Bedford SS | 5:40.19 |