EVENT 507 Mens Open 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 9 | Matthew Woodhall | 14 | Nova Cent'n | 17:32.39 |
| 2 | 10 | Joshua Skinner | 15 | Nova Cent'n | 16:51.77 |
| 3 | 11 | Jevon Penny | 15 | Northampton | 16:51.43 |
| 4 | 12 | Edward Mildred | 15 | Northampton | 16:45.84 |
| 5 | 13 | Dara Clarke | 16 | Co Lincoln P | 16:44.19 |
| 6 | 14 | Samuel Blackett | 20 | Northampton | 16:43.85 |
| 7 | 15 | Jackson O'Rourke | 16 | Northampton | 16:39.89 |
| 8 | 16 | Rhys Taylor | 18 | Nova Cent'n | 16:34.06 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Thomas Polley | 12 | Nova Cent'n | 20:29.73 |
| 2 | 2 | Kallum Quirke | 12 | Nova Cent'n | 20:18.85 |
| 3 | 3 | Max Davies | 13 | Nova Cent'n | 19:10.29 |
| 4 | 4 | Samuel Smith | 13 | Northampton | 18:53.32 |
| 5 | 5 | Max Shaw | 13 | Northampton | 18:43.77 |
| 6 | 6 | Razvan Grumazescu | 14 | Northampton | 18:08.43 |
| 7 | 7 | Callum Kettlewell | 14 | Bassetlaw SS | 17:45.27 |
| 8 | 8 | Jacob Whittle | 14 | Derventio | 17:35.67 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 18 | Jack Buswell | 17 | Northampton | 16:32.51 |
| 2 | 20 | Liam Snook | 20 | Northampton | 16:17.42 |
| 3 | 22 | Ryan Reader | 20 | Derventio | 15:56.94 |
| 4 | 24 | William Bell | 16 | Co Leicester | 15:40.99 |
| 5 | 23 | Nathan Wells | 20 | Loughboro Un | 15:52.71 |
| 6 | 21 | Ross Hill | 21 | Loughboro Un | 16:04.50 |
| 7 | 19 | Archie Plowman | 17 | Northampton | 16:17.75 |
| 8 | 17 | Joseph Kingsland | 15 | Nova Cent'n | 16:33.86 |