EVENT 206 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Aden VAN HOOREBEEK | 11 | Eckington | 7:00.00 |
| 3 | 3 | Joshua GILL | 18 | Gainsborough | 6:12.10 |
| 4 | 2 | Dan PALMER | 9 | Co Lincoln P | 6:26.87 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 5 | Oliver GARNER | 12 | Co Lincoln P | 5:50.00 |
| 3 | 7 | Samuel POTTER | 13 | Bassetlaw SS | 5:25.59 |
| 4 | 6 | Lewis TARVER | 14 | Deepings | 5:33.09 |
| 5 | 4 | Oscar WAINWRIGHT | 13 | Matlock | 6:06.12 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Henry JONES | 13 | Eckington | 5:19.61 |
| 2 | 11 | C BUTTERELL-QUANBROUGH | 12 | Bassetlaw SS | 5:06.21 |
| 3 | 13 | Evan JOHNSON | 13 | Derventio | 5:04.81 |
| 4 | 12 | Jacob BRIERS | 14 | Deepings | 5:06.04 |
| 5 | 10 | Aidan FITZGIBBON | 14 | Co Lincoln P | 5:06.23 |
| 6 | 8 | Harry ASTON | 14 | Derventio | 5:19.71 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Finlay BIRD | 12 | Derventio | 4:58.20 |
| 2 | 17 | Thomas HEPPLESTONE | 16 | Co Lincoln P | 4:56.38 |
| 3 | 19 | Jensen HYLTON | 14 | Co Lincoln P | 4:55.00 |
| 4 | 18 | Liam LYONS | 13 | Derventio | 4:56.36 |
| 5 | 16 | Cole WEBSTER | 14 | Derventio | 4:57.75 |
| 6 | 14 | Samuel GREEN | 12 | Bassetlaw SS | 5:00.15 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 21 | Noah VAN HOOREBEEK | 15 | Eckington | 4:42.70 |
| 2 | 23 | Archie HERON | 16 | Derventio | 4:31.07 |
| 3 | 25 | Leo ALLANSON | 16 | Derventio | 4:21.18 |
| 4 | 24 | Oliver OSBORNE | 15 | Derventio | 4:31.05 |
| 5 | 22 | Seth HINITT | 16 | Bassetlaw SS | 4:38.59 |
| 6 | 20 | Morgan FARRAR | 13 | Co Lincoln P | 4:54.41 |