EVENT 101 Open/Male 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 1 | Maxwell BLAKE-EVENDEN | 13 | Weymouth | 6:33.79 |
| 2 | 3 | Tyler DOUGLAS | 11 | Blandford | 6:00.13 |
| 3 | 5 | Edward KEEN | 13 | Bridport Bar | 5:41.02 |
| 4 | 4 | Joseph RUDD | 13 | Weymouth | 5:48.19 |
| 5 | 2 | Stanley WEIGHELL | 15 | Seagulls SC | 6:18.06 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 7 | Benjamin CRUMPLER | 11 | S Bournem'th | 5:00.68 |
| 2 | 9 | Liam DETRICK | 10 | S Bournem'th | 4:56.02 |
| 3 | 11 | George GORDON | 11 | Bridport Bar | 4:47.44 |
| 4 | 10 | Thomas GLEESON | 10 | Seagulls SC | 4:49.55 |
| 5 | 8 | Frank TURNER | 11 | West Dorset | 4:58.53 |
| 6 | 6 | James NEESAM | 08 | Poole | 5:05.75 |