EVENT 401 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 3 | 1 | Benjamin Rees | 19 | S6 | Mansfield | 7:48.10 |
| 4 | 3 | Isaac Von Fintel | 15 | | Leic Peng | 4:19.93 |
| 5 | 2 | Benjamin Foulston | 16 | S10 | Nova Cent'n | 4:22.60 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 4 | Brett Davies | 15 | | Northampton | 4:19.80 |
| 2 | 6 | Daniel Johnson | 14 | | Royal Wolv | 4:18.90 |
| 3 | 8 | Dante Des Rosier | 14 | | Ellesmere Co | 4:17.00 |
| 4 | 10 | Charlie Palmer | 15 | | Derventio | 4:14.80 |
| 5 | 9 | Alexander Hindle | 14 | | Co Birm'ham | 4:16.90 |
| 6 | 7 | Ben Cope | 15 | | Royal Wolv | 4:17.90 |
| 7 | 5 | Thomas Beamer | 14 | | Strat Sharks | 4:19.08 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 12 | George Alton | 17 | | Chesterfield | 4:13.40 |
| 2 | 14 | Thomas Christie-Smith | 16 | | Co Leicester | 4:12.84 |
| 3 | 16 | Patrick Meggitt | 28 | | Co Hereford | 4:11.88 |
| 4 | 18 | Adam Metcalf | 15 | | Ellesmere Co | 4:11.30 |
| 5 | 17 | Billy Pettit | 15 | | Northampton | 4:11.60 |
| 6 | 15 | Samuel Neeld | 16 | | Wrekin Coll | 4:11.91 |
| 7 | 13 | Bradley Capell | 18 | | Co Leicester | 4:13.17 |
| 8 | 11 | Aidan Wright | 18 | | Grantham | 4:13.88 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 22 | Thomas Smith | 18 | | Northampton | 4:09.40 |
| 2 | 28 | Hector Pardoe | 15 | | Ellesmere Co | 4:07.70 |
| 3 | 34 | Archie Plowman | 15 | | Northampton | 4:03.50 |
| 4 | 40 | Ross Hill | 19 | | Loughboro Un | 3:58.10 |
| 5 | 37 | Liam Snook | 18 | | Northampton | 4:02.10 |
| 6 | 31 | William Foster | 16 | | Co Derby | 4:04.74 |
| 7 | 25 | Samuel Dyer | 16 | | Northampton | 4:08.40 |
| 8 | 19 | Lewis Hodgetts | 17 | | Royal Wolv | 4:11.00 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 23 | Adel Elfakir | 20 | | Northampton | 4:09.30 |
| 2 | 29 | Simon Scully | 17 | | Co Leicester | 4:07.27 |
| 3 | 35 | Gordon Mason | 17 | | Ellesmere Co | 4:03.10 |
| 4 | 41 | Casey Barrett | 17 | | Royal Wolv | 3:57.40 |
| 5 | 38 | Nathan Wells | 17 | | Ellesmere Co | 4:00.90 |
| 6 | 32 | Kane Murcott | 16 | | Royal Wolv | 4:04.60 |
| 7 | 26 | Jack Buswell | 15 | | Northampton | 4:08.10 |
| 8 | 20 | Rhys Taylor | 16 | | Nova Cent'n | 4:10.84 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 24 | Harry Bamforth | 16 | | Ellesmere Co | 4:08.90 |
| 2 | 30 | Maxwell Dalziel | 19 | | Ellesmere Co | 4:05.70 |
| 3 | 36 | William Gayne | 17 | | Nova Cent'n | 4:02.78 |
| 4 | 42 | Ryan Reader | 18 | | Derventio | 3:56.20 |
| 5 | 39 | William Bell | 14 | | Co Leicester | 3:59.00 |
| 6 | 33 | Harry Hathaway | 19 | | Leic Peng | 4:04.50 |
| 7 | 27 | Conor Ferguson | 17 | | Ellesmere Co | 4:08.00 |
| 8 | 21 | Joshua Harris | 15 | | Nova Cent'n | 4:09.50 |