EVENT 601 Men Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Daniel Thompson | 15 | Thurrock | 5:09.12 |
| 4 | 3 | Sean Connolly | 14 | Epping For't | 5:08.25 |
| 5 | 2 | Charlie McKinnon | 15 | St Felix Sch | 5:08.78 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Timon Chapman | 20 | Co Norwich | 5:07.63 |
| 2 | 7 | Ben Howlett | 15 | teamipswich | 5:07.50 |
| 3 | 9 | Corey Hare | 16 | Colchester | 5:05.10 |
| 4 | 11 | Kian Lee | 14 | Co Peterboro | 5:02.96 |
| 5 | 10 | William Robins | 19 | Biggleswade | 5:04.27 |
| 6 | 8 | Daniel Kendall | 16 | Co Ely | 5:07.08 |
| 7 | 6 | Benjamin Taggart | 15 | Watford SC | 5:07.63 |
| 8 | 4 | Adam Hazlewood | 18 | Putteridge | 5:08.20 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Ewan Thompson | 16 | St Ives | 5:01.71 |
| 2 | 15 | Kieran Birkett | 17 | Co St Albans | 5:00.00 |
| 3 | 17 | Jamie Joshua | 16 | Hatfield | 4:56.64 |
| 4 | 19 | Jack Barnard | 17 | Potters Bar | 4:54.90 |
| 5 | 18 | Orlando Dearing | 14 | Co Peterboro | 4:56.62 |
| 6 | 16 | George Prince | 14 | Hatfield | 4:57.07 |
| 7 | 14 | Robert Fenner | 14 | Basildon Ph | 5:01.04 |
| 8 | 12 | James Peacock | 16 | Co Peterboro | 5:02.04 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Ryan Roberts | 17 | Putteridge | 4:54.59 |
| 2 | 23 | Daryl Rands | 25 | Colchester | 4:54.10 |
| 3 | 25 | Sandijs Cecins | 15 | Colchester | 4:52.79 |
| 4 | 27 | Zak Troman | 15 | teamipswich | 4:51.00 |
| 5 | 26 | Samuel Peck | 22 | Norwich Swan | 4:51.50 |
| 6 | 24 | Harrison Shaw | 15 | Flitwick | 4:53.69 |
| 7 | 22 | Daniel Holliss | 16 | Co St Albans | 4:54.24 |
| 8 | 20 | Samuel Winslow | 15 | Co Cambridge | 4:54.81 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 29 | Joshua Sackree | 14 | Co Peterboro | 4:49.31 |
| 2 | 31 | Matthew Monie | 17 | Co Cambridge | 4:47.81 |
| 3 | 33 | Daniel McGuinness | 16 | Basildon Ph | 4:41.20 |
| 4 | 35 | Nathan Wells | 24 | West Norfolk | 4:23.44 |
| 5 | 34 | Myles Turner | 22 | West Suffolk | 4:29.40 |
| 6 | 32 | Patch Robinson | 15 | teamipswich | 4:44.70 |
| 7 | 30 | Daniel Moyses | 16 | Co Peterboro | 4:47.90 |
| 8 | 28 | Jason Ho | 16 | Hatfield | 4:50.81 |