EVENT 234 Men Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Thomas Spelman | 15 | Stowmarket | 5:24.39 |
| 4 | 3 | Batu Senturk | 16 | Co Cambridge | 5:19.93 |
| 5 | 2 | Benjamin Taggart | 15 | Watford SC | 5:21.39 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Charlie McKinnon | 15 | St Felix Sch | 5:17.90 |
| 2 | 7 | Daniel Thompson | 15 | Thurrock | 5:13.10 |
| 3 | 9 | Ben Buckley | 15 | Co Norwich | 5:10.20 |
| 4 | 11 | William Buckley | 16 | Watford SC | 5:08.76 |
| 5 | 10 | Christopher Howe | 17 | Co Cambridge | 5:08.87 |
| 6 | 8 | Samuel Winslow | 15 | Co Cambridge | 5:11.48 |
| 7 | 6 | Oliver Smith | 15 | Basildon Ph | 5:16.81 |
| 8 | 4 | Austin Harrop | 16 | Co Cambridge | 5:19.87 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 13 | Ben Howlett | 15 | teamipswich | 5:08.09 |
| 2 | 15 | Oliver Blight | 16 | Hatfield | 5:07.26 |
| 3 | 17 | Jamie Joshua | 16 | Hatfield | 5:06.60 |
| 4 | 19 | Corey Hare | 16 | Colchester | 5:05.10 |
| 5 | 18 | Lucas Hartley | 15 | Hatfield | 5:06.00 |
| 6 | 16 | Daniel Kendall | 16 | Co Ely | 5:07.08 |
| 7 | 14 | Timon Chapman | 20 | Co Norwich | 5:07.63 |
| 8 | 12 | Adam Hazlewood | 18 | Putteridge | 5:08.20 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Harry Stagg | 16 | Basildon Ph | 5:02.47 |
| 2 | 23 | Harrison Shaw | 15 | Flitwick | 5:02.00 |
| 3 | 25 | Patch Robinson | 15 | teamipswich | 5:01.36 |
| 4 | 27 | Lewis Archer | 25 | Halstead | 4:59.48 |
| 5 | 26 | Antonio Girolami | 17 | Colchester | 5:00.38 |
| 6 | 24 | Kieran Birkett | 17 | Co St Albans | 5:01.80 |
| 7 | 22 | James Peacock | 16 | Co Peterboro | 5:02.04 |
| 8 | 20 | Richard Vanstone | 16 | Chelmsford | 5:02.78 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 29 | Daryl Rands | 25 | Colchester | 4:55.88 |
| 2 | 31 | Ben Minister | 16 | Thurrock | 4:55.20 |
| 3 | 33 | Austin Lillywhite | 19 | Biggleswade | 4:55.08 |
| 4 | 35 | Ryan Roberts | 17 | Putteridge | 4:54.59 |
| 5 | 34 | Jack Barnard | 17 | Potters Bar | 4:54.90 |
| 6 | 32 | Daniel Moyses | 16 | Co Peterboro | 4:55.15 |
| 7 | 30 | Archie Chamberlain | 16 | West Suffolk | 4:55.45 |
| 8 | 28 | Jason Ho | 16 | Hatfield | 4:57.83 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 37 | William Loveman | 22 | Co St Albans | 4:54.14 |
| 2 | 39 | Sandijs Cecins | 15 | Colchester | 4:52.79 |
| 3 | 41 | Matthew Monie | 17 | Co Cambridge | 4:51.71 |
| 4 | 43 | Freddie Laws | 19 | West Norfolk | 4:44.29 |
| 5 | 42 | Zak Troman | 15 | Colchester | 4:51.63 |
| 6 | 40 | Edward Ormsby | 15 | Co Cambridge | 4:52.60 |
| 7 | 38 | Ethan Howard | 15 | Potters Bar | 4:53.30 |
| 8 | 36 | Daniel Holliss | 16 | Co St Albans | 4:54.24 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 45 | Daniel McGuinness | 16 | Basildon Ph | 4:41.20 |
| 2 | 47 | Nikita Charykin | 16 | Thurrock | 4:36.94 |
| 3 | 49 | Myles Turner | 22 | West Suffolk | 4:29.40 |
| 4 | 51 | Nathan Wells | 24 | West Norfolk | 4:23.44 |
| 5 | 50 | Joe Cooper | 18 | teamipswich | 4:27.20 |
| 6 | 48 | Mark Milburn | 17 | Colchester | 4:34.73 |
| 7 | 46 | Sami Zemzami | 17 | Bishop Stort | 4:39.25 |
| 8 | 44 | Olivier Vedrenne | 17 | Co Norwich | 4:43.80 |