EVENT 501 Men's 800m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 1 | 1 | Samuel Williams | 07 | Wycombe Dist | 8:35.54 |
| 2 | 3 | Jack Booth Rudd | 04 | Portsmouth N | 8:34.76 |
| 3 | 5 | Matthew Warburton | 05 | Warrington W | 8:33.75 |
| 4 | 7 | Lewis Maxwell | 03 | N & D PP SC | 8:33.44 |
| 5 | 6 | Joseph Kingsland | 03 | Nova Cent'n | 8:33.59 |
| 6 | 4 | Hayden Annan | 07 | RTW Monson | 8:33.94 |
| 7 | 2 | Daniel Cox | 04 | Birm'ham Uni | 8:35.52 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 9 | Finn Drysdale | 05 | Royal Wolv | 8:33.14 |
| 1 | 11 | Joseph Moment | 06 | KingstonHull | 8:31.97 |
| 2 | 13 | James Raw | 07 | Leic Sharks | 8:31.33 |
| 3 | 15 | Luke Booth | 05 | Rotherham Mo | 8:30.22 |
| 4 | 17 | Ethan Kelly | 08 | Co Liverpool | 8:26.59 |
| 5 | 16 | Jude Liddiard | 01 | Edinburgh Un | 8:28.31 |
| 6 | 14 | Josh Denholm | 05 | Newcastle | 8:30.44 |
| 7 | 12 | Matthew Shipley | 02 | Kimberley | 8:31.87 |
| 8 | 10 | Samuel Lander | 06 | Mt Kelly | 8:32.54 |
| 9 | 8 | Daniel Jackson | 06 | Bo Kirklees | 8:33.16 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 19 | Michael James Flynn | 03 | Co Glasgow | 8:25.61 |
| 1 | 21 | Samuel Sterry | 07 | TigersJersey | 8:25.21 |
| 2 | 23 | Christian Duetoft | 05 | Guildford Ct | 8:23.44 |
| 3 | 25 | Rafae Shafi | 05 | Repton | 8:20.19 |
| 4 | 27 | Oliver Rowe | 06 | Mt Kelly | 8:18.84 |
| 5 | 26 | Arthur Logan | 04 | Edinburgh Un | 8:18.90 |
| 6 | 24 | Cameron Travis | 04 | UoAPS | 8:21.57 |
| 7 | 22 | Kourosh Khodakhah | 07 | Co Leeds | 8:23.45 |
| 8 | 20 | Sean McCann | 05 | Lboro Uni | 8:25.48 |
| 9 | 18 | Reuben Visda | 03 | Co Sheffield | 8:26.22 |