EVENT 609 Open/Male 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Jamie Wilson | 15 | West Norfolk | 9:11.50 |
| 2 | 4 | George Carter | 16 | Co Cambridge | 8:58.69 |
| 3 | 6 | Jacob Bacon | 14 | Co Peterboro | 8:54.70 |
| 4 | 8 | Ben Howlett | 17 | teamipswich | 8:53.98 |
| 5 | 7 | B Macdonald-Williams | 16 | Bishop Stort | 8:54.08 |
| 6 | 5 | Charlie McKinnon | 17 | Norwich Swan | 8:56.31 |
| 7 | 3 | Frank Lamb | 15 | Co Peterboro | 9:02.56 |
| 8 | 1 | Perrin Ma | 13 | Hatfield | 9:14.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Robert Fenner | 16 | Basildon Ph | 8:49.71 |
| 2 | 12 | George Hooper | 17 | Co St Albans | 8:42.99 |
| 3 | 14 | Daniel Belsey | 16 | Hatfield | 8:31.50 |
| 4 | 16 | Ryan Wall | 17 | Co Cambridge | 8:29.20 |
| 5 | 15 | Patch Robinson | 17 | teamipswich | 8:31.30 |
| 6 | 13 | Adam O'Neal | 16 | Bedford SS | 8:39.20 |
| 7 | 11 | Conor Mint | 15 | Basildon Ph | 8:47.40 |
| 8 | 9 | Luke Martell | 18 | Watford SC | 8:51.70 |