EVENT 104 Mens Open 400m Freestyle - Heats
Not Competing : 26
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 3 | 1 | James Cowburn | 90 | Swansea Perf | 4:04.54 |
| 4 | 3 | Christopher Wilkinson | 91 | Co Leeds | 4:03.54 |
| 5 | 2 | James Gibson | 91 | Stockport Mo | 4:03.61 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 6 | Ross Douglas | 89 | Swansea Perf | 4:02.24 |
| 2 | 12 | Matthew Parks | 93 | Co Manch Aq | 3:59.55 |
| 3 | 18 | Daniel Coombs | 88 | Loughboro Un | 3:54.74 |
| 4 | 24 | Joshua Walsh | 91 | Blackburn | 3:52.74 |
| 5 | 21 | Thomas Allen | 92 | Swansea Perf | 3:53.18 |
| 6 | 15 | Xavier Mohammed | 90 | Co Cardiff | 3:58.53 |
| 7 | 9 | John Gallichan | 91 | Co Liverpool | 4:01.02 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 7 | Jordan Theaker | 93 | Preston | 4:01.92 |
| 2 | 13 | Thomas Greenfield | 89 | Co Cardiff | 3:59.31 |
| 3 | 19 | Ross Davenport | 84 | Loughboro Un | 3:54.10 |
| 4 | 25 | Robert Renwick | 88 | Co Glasgow | 3:50.85 |
| 5 | 22 | Lewis Smith | 88 | Warrender Ba | 3:53.15 |
| 6 | 16 | Thomas Sunter | 92 | Co Sheffield | 3:56.97 |
| 7 | 10 | Roberto Pavoni | 91 | Brentwood | 4:00.76 |
| 8 | 4 | Gregory Bird | 89 | Loughboro Un | 4:03.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 1 | 8 | Daniel Cocking | 90 | Co Sheffield | 4:01.03 |
| 2 | 14 | Alfie Howes | 92 | Co Cardiff | 3:58.62 |
| 3 | 20 | Richard Charlesworth | 88 | Hatfield | 3:53.83 |
| 4 | 27 | David Carry | 81 | Stockport Mo | 3:50.06 |
| 5 | 23 | Daniel Fogg | 87 | Loughboro Un | 3:53.02 |
| 6 | 17 | Matthew Johnson | 95 | Co Sheffield | 3:55.93 |
| 7 | 11 | Jack Burnell | 93 | Lincoln Vulc | 4:00.35 |
| 8 | 5 | Alexander Jones | 91 | Co Leeds | 4:03.00 |