EVENT 108 Boy Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Jack BIGNELL | 13 | Northampton | 5:55.97 |
| 3 | 4 | Sam GRAY | 14 | Northampton | 5:44.62 |
| 4 | 3 | Jacob BRIERS | 13 | Deepings | 5:53.35 |
| 5 | 1 | Jacob PEMBERTON | 12 | Derventio | 6:24.45 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Jasper JONES | 14 | Northampton | 5:25.10 |
| 2 | 8 | Leo ALLANSON | 15 | Derventio | 5:01.69 |
| 3 | 10 | Joe STRATTON | 17 | Royal Wolv | 4:53.40 |
| 4 | 9 | Brooke TOTNEY | 17 | Royal Wolv | 4:56.61 |
| 5 | 7 | Oliver STONE | 13 | Derventio | 5:19.00 |
| 6 | 5 | Manav MISTRY | 14 | Northampton | 5:39.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 12 | Jean-Luc LOVELL-PASCAL | 16 | Royal Wolv | 4:51.94 |
| 2 | 14 | Andrew JONES | 17 | Royal Wolv | 4:47.09 |
| 3 | 16 | Joshua VANCE | 18 | Northampton | 4:30.12 |
| 4 | 15 | Liam DAWSON | 16 | Royal Wolv | 4:37.50 |
| 5 | 13 | James SHEVCHENKO | 16 | Royal Wolv | 4:51.40 |
| 6 | 11 | Ethan ELLIS-SIXSMITH | 18 | Royal Wolv | 4:52.74 |