EVENT 524 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 2 | Tyler BROWN | 11 | Mansfield | 6:09.08 |
| 3 | 4 | Benjamin BRIGGS | 14 | Deepings | 5:31.33 |
| 4 | 6 | Frankie ALDRIDGE | 13 | Co Leicester | 5:20.98 |
| 5 | 5 | Joshua WARD | 14 | Co Leicester | 5:25.60 |
| 6 | 3 | Harry BEARD | 14 | Coalville | 5:33.55 |
| 7 | 1 | Henry SEWELL | 11 | Shrewsbury | 6:47.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 8 | Kieran BOTT | 13 | Co Leicester | 5:10.09 |
| 2 | 10 | Charlie KALETHA | 12 | Co Leicester | 5:00.21 |
| 3 | 12 | Kallum PENMAN | 14 | Deepings | 4:53.40 |
| 4 | 14 | James BRETT | 14 | Braunstone | 4:49.12 |
| 5 | 13 | Kai BACON | 13 | Co Leicester | 4:50.33 |
| 6 | 11 | James LE GRICE | 13 | Co Leicester | 4:54.03 |
| 7 | 9 | Luke CHAPMAN | 13 | Braunstone | 5:04.20 |
| 8 | 7 | Joseph ROWLEY | 14 | Shrewsbury | 5:15.91 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 16 | Christopher SNEESBY | 14 | Co Leicester | 4:40.23 |
| 2 | 18 | Thomas GREIG | 15 | Chesterfield | 4:36.77 |
| 3 | 20 | Lucas TAYLOR | 15 | Braunstone | 4:34.02 |
| 4 | 22 | Simon SCULLY | 17 | Co Leicester | 4:16.99 |
| 5 | 21 | Bradley CAPELL | 18 | Co Leicester | 4:17.51 |
| 6 | 19 | Finlay CHAPMAN | 15 | Braunstone | 4:34.03 |
| 7 | 17 | Rakshansingh PARMESSUR | 15 | Leicester Ne | 4:39.80 |
| 8 | 15 | James WATSON | 14 | Co Leicester | 4:44.05 |