EVENT 601 Open/Male 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Kian Ptolomey | 15 | Putteridge | 5:03.03 |
| 4 | 4 | Janos Csepely | 14 | teamipswich | 5:02.00 |
| 5 | 3 | Kameron Baker | 14 | Co Peterboro | 5:02.68 |
| 6 | 1 | Alexander Ball | 18 | Potters Bar | 5:03.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Daniel Meier | 18 | Biggleswade | 5:01.56 |
| 2 | 8 | Alexander Pattison | 15 | West Norfolk | 4:59.54 |
| 3 | 10 | Theodore Monk | 17 | Co Cambridge | 4:55.70 |
| 4 | 12 | Philip Spalding | 15 | Putteridge | 4:55.05 |
| 5 | 11 | Tyler Stone | 15 | Co Norwich | 4:55.20 |
| 6 | 9 | George Heather | 15 | Co Peterboro | 4:58.74 |
| 7 | 7 | Zachary Piscopo | 14 | Co Peterboro | 4:59.60 |
| 8 | 5 | Ivan Ijomoni | 14 | Thurrock | 5:02.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Luke Owens | 15 | Putteridge | 4:53.00 |
| 2 | 16 | Joshua Jones | 16 | West Norfolk | 4:51.28 |
| 3 | 18 | Daniel Moyses | 19 | Co Peterboro | 4:49.90 |
| 4 | 20 | Kian Lee | 17 | Co Peterboro | 4:46.52 |
| 5 | 19 | George Prince | 17 | Putteridge | 4:48.69 |
| 6 | 17 | Jamie Wilson | 16 | West Norfolk | 4:51.04 |
| 7 | 15 | Luke Martell | 19 | Watford SC | 4:52.57 |
| 8 | 13 | Finlay German | 16 | Co Cambridge | 4:54.71 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 22 | Frank Lamb | 16 | Co Peterboro | 4:42.30 |
| 2 | 24 | Samuel Jeffrey | 18 | Hatfield | 4:40.27 |
| 3 | 26 | Harrison Shaw | 18 | Flitwick | 4:35.44 |
| 4 | 28 | Edward Ormsby | 18 | Co Cambridge | 4:33.34 |
| 5 | 27 | Oscar Winterburn | 17 | teamipswich | 4:35.36 |
| 6 | 25 | Robert Fenner | 17 | Basildon Ph | 4:39.04 |
| 7 | 23 | Lewis Jarrett | 19 | Co Norwich | 4:40.61 |
| 8 | 21 | Csanad Rehus | 16 | Co Peterboro | 4:45.10 |