EVENT 209 Men Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Lewis Archer | 24 | Halstead | 4:27.26 |
| 4 | 4 | Jago Derrington | 15 | Bishop Stort | 4:25.67 |
| 5 | 3 | Jack Barnard | 16 | Potters Bar | 4:27.26 |
| 6 | 1 | Joe Power | 14 | Basildon Ph | 4:28.28 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 6 | Jamie Joshua | 15 | Hatfield | 4:25.44 |
| 2 | 8 | Sandijs Cecins | 14 | Colchester | 4:22.59 |
| 3 | 10 | Jack Pallant | 17 | Team Waveney | 4:19.40 |
| 4 | 12 | Marin De Villard | 16 | St Felix Sch | 4:18.90 |
| 5 | 11 | Daniel McGuinness | 15 | Basildon Ph | 4:19.36 |
| 6 | 9 | Matthew Brown | 16 | Stowmarket | 4:20.17 |
| 7 | 7 | Matthew Monie | 16 | Co Cambridge | 4:24.60 |
| 8 | 5 | Thomas Ford | 15 | Basildon Ph | 4:25.45 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 14 | Ryan Wall | 14 | Co Cambridge | 4:15.11 |
| 2 | 16 | Jack Sangster | 20 | Modernian | 4:10.10 |
| 3 | 18 | Jacques Bonsell | 22 | Co Cambridge | 3:58.36 |
| 4 | 20 | Nathan Wells | 23 | West Norfolk | 3:49.12 |
| 5 | 19 | Michael Klimaszewski | 17 | Hatfield | 3:58.03 |
| 6 | 17 | Joe Cooper | 17 | teamipswich | 4:00.20 |
| 7 | 15 | Joseph Wells | 22 | West Norfolk | 4:11.60 |
| 8 | 13 | Thomas Woolley | 18 | Co Cambridge | 4:17.30 |