EVENT 209 Men Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Jack Barnard | 17 | Potters Bar | 4:19.29 |
| 2 | 3 | Daniel Belsey | 14 | Hatfield | 4:18.80 |
| 3 | 5 | Daniel Clayton | 16 | teamipswich | 4:16.10 |
| 4 | 7 | William Ellard | 16 | St Felix Sch | 4:14.85 |
| 5 | 6 | Reece Barclay | 31 | Epping For't | 4:15.01 |
| 6 | 4 | Orlando Dearing | 14 | Co Peterboro | 4:17.30 |
| 7 | 2 | Thomas Ford | 16 | Basildon Ph | 4:19.05 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Daniel Moyses | 16 | Co Peterboro | 4:13.10 |
| 2 | 11 | Daniel McGuinness | 16 | Basildon Ph | 4:10.08 |
| 3 | 13 | Matthew Baker | 16 | West Suffolk | 4:02.30 |
| 4 | 15 | Regan Lloyd | 25 | teamipswich | 3:52.36 |
| 5 | 14 | Jacques Bonsell | 23 | Co Cambridge | 3:59.70 |
| 6 | 12 | Marin De Villard | 17 | St Felix Sch | 4:05.10 |
| 7 | 10 | Ryan Wall | 15 | Co Cambridge | 4:10.30 |
| 8 | 8 | Matthew Monie | 17 | Co Cambridge | 4:14.83 |