EVENT 212 Men 12/14 Yrs 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | Harry Phelan | 12 | Basildon Ph | 6:33.79 |
| 4 | 3 | Csanad Rehus | 12 | Co Peterboro | 6:32.59 |
| 5 | 2 | Toby Lashmar | 12 | Basildon Ph | 6:32.72 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Adam O'Neal | 13 | Modernian | 6:14.29 |
| 3 | 7 | Jude Gunner | 12 | St Felix Sch | 6:04.41 |
| 4 | 9 | Oscar Winterburn | 13 | teamipswich | 5:53.92 |
| 5 | 8 | Jamie Wilson | 12 | Wisbech | 5:58.45 |
| 6 | 6 | Ben Every | 13 | St Felix Sch | 6:05.30 |
| 7 | 4 | Harrison Brook | 13 | Colchester | 6:15.83 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | Louis Allen | 13 | Basildon Ph | 5:43.00 |
| 2 | 13 | Jacob Lowe | 14 | March | 5:40.19 |
| 3 | 15 | Ross De Wildt | 13 | Co Cambridge | 5:39.30 |
| 4 | 17 | James Williamson | 14 | Co Cambridge | 5:36.31 |
| 5 | 16 | Ben Buckley | 14 | Co Norwich | 5:37.90 |
| 6 | 14 | Thomas Spelman | 14 | Stowmarket | 5:40.06 |
| 7 | 12 | Samuel Winslow | 14 | Co Cambridge | 5:40.79 |
| 8 | 10 | Alex Harrop | 13 | teamipswich | 5:52.01 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Patch Robinson | 14 | teamipswich | 5:35.91 |
| 2 | 21 | Lucas Hartley | 14 | Hatfield | 5:32.57 |
| 3 | 23 | James Gourpinar | 14 | Harlow Pen | 5:28.80 |
| 4 | 25 | Zak Troman | 14 | Colchester | 5:15.00 |
| 5 | 24 | Ryan Wall | 14 | Co Cambridge | 5:16.16 |
| 6 | 22 | Ben Howlett | 14 | teamipswich | 5:30.55 |
| 7 | 20 | Harrison Shaw | 14 | Flitwick | 5:35.48 |
| 8 | 18 | Massimo Girolami | 13 | Colchester | 5:36.20 |