EVENT 733 Open/Male 11/14 Yrs 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Tobias Anderson | 12 | Co Norwich | 6:19.50 |
| 3 | 3 | Spencer Gore | 12 | Southend | 6:16.60 |
| 4 | 5 | Casper Whittaker | 12 | Biggleswade | 6:07.50 |
| 5 | 4 | San Choi | 12 | Co Cambridge | 6:08.10 |
| 6 | 2 | Riley Allen | 12 | Thurrock | 6:16.90 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Ashton Hunter | 12 | Co Peterboro | 5:59.09 |
| 2 | 9 | Alfie Larham | 12 | Co Peterboro | 5:56.80 |
| 3 | 11 | Finley Burford | 12 | Basildon Ph | 5:52.34 |
| 4 | 13 | Jacob Wild | 13 | Newmarket | 5:44.00 |
| 5 | 12 | Lewis Borgognoni | 13 | Co Peterboro | 5:47.72 |
| 6 | 10 | James Peters | 13 | Basildon Ph | 5:52.70 |
| 7 | 8 | Montgomery Brewster | 12 | Watford SC | 5:59.06 |
| 8 | 6 | Hugo Koyanagi | 12 | Co St Albans | 6:06.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Thomas Fenwick | 13 | Team Luton | 5:36.71 |
| 2 | 17 | Zachary Piscopo | 13 | Co Peterboro | 5:29.50 |
| 3 | 19 | George Heather | 14 | Co Peterboro | 5:26.77 |
| 4 | 21 | Jake Battle | 13 | Stowmarket | 5:25.29 |
| 5 | 20 | Ivan Ijomoni | 13 | Thurrock | 5:26.60 |
| 6 | 18 | Alexander Pattison | 14 | West Norfolk | 5:29.40 |
| 7 | 16 | Kian Ptolomey | 14 | Putteridge | 5:34.96 |
| 8 | 14 | Ethan Knights | 13 | teamipswich | 5:41.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Kameron Baker | 13 | Co Peterboro | 5:24.58 |
| 2 | 25 | Luke Owens | 14 | Putteridge | 5:18.50 |
| 3 | 27 | Kieran Ng | 14 | Co Peterboro | 5:06.40 |
| 4 | 29 | Jacob Bacon | 14 | Co Peterboro | 4:58.71 |
| 5 | 28 | Patryk Nowak | 14 | Co Peterboro | 5:01.25 |
| 6 | 26 | William Hughes | 14 | Basildon Ph | 5:08.70 |
| 7 | 24 | Philip Spalding | 14 | Putteridge | 5:20.58 |
| 8 | 22 | Will Minister | 14 | Thurrock | 5:25.10 |