EVENT 308 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 1 | JAMES MISSIN | 14 | | DerbyPhoenix | |
| 2 | 3 | ELIAN JEMOUR | 10 | | Co Sheffield | 7:35.01 |
| 3 | 5 | ADEN VAN HOOREBEEK | 12 | | Chesterfield | 7:09.58 |
| 4 | 7 | COREY HESELTINE | 11 | | Retford | 6:26.89 |
| 5 | 6 | SIDNEY STEWART | 12 | | Co Sheffield | 6:36.71 |
| 6 | 4 | SEBASTIAN BRIGGS | 12 | | Swadlincote | 7:25.83 |
| 7 | 2 | LUQMAN ABDI | 13 | S6 | Co Coventry | 11:00.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 9 | RONNIE PARKER | 12 | | Co Sheffield | 6:24.70 |
| 2 | 11 | ELLIS MILLINGTON | 11 | | Sherwood | 6:08.00 |
| 3 | 13 | ELI MOODLEY | 11 | | NottmLeander | 5:50.60 |
| 4 | 15 | MASON CAMERON | 12 | | Co Sheffield | 5:38.01 |
| 5 | 14 | DEXTER AKEHURST | 10 | | Co Sheffield | 5:41.00 |
| 6 | 12 | DEXTER GROCOCK | 11 | | Co Sheffield | 6:07.30 |
| 7 | 10 | JAMES LEE | 10 | | Derby Excel | 6:10.20 |
| 8 | 8 | ERNESTO GARCIA | 11 | | Co Sheffield | 6:25.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 17 | OLIVER SMITH | 10 | | Repton | 5:11.46 |
| 2 | 19 | HAYDEN HUDSON | 12 | | Chesterfield | 5:00.95 |
| 3 | 21 | KAI GELSTHORPE | 17 | S10 | Derby Excel | 4:50.70 |
| 4 | 23 | NOAH VAN HOOREBEEK | 15 | | Chesterfield | 4:30.49 |
| 5 | 22 | JOEL HARBY | 14 | | Sherwood | 4:44.67 |
| 6 | 20 | BEAU BIRTLES | 14 | | Chesterfield | 5:00.05 |
| 7 | 18 | GETHIN SINCLAIR | 13 | | Co Sheffield | 5:04.47 |
| 8 | 16 | ISAAC EBANKS | 12 | | Derby Excel | 5:18.12 |