EVENT 301 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 1 | McKenzie O'REILLY | 10 | S10 | Gloucester | 9:37.60 |
| 2 | 3 | Akaash Das | 11 | S8 | Oswestry Ott | 7:37.32 |
| 3 | 5 | A Moradianborougeni | 15 | S13 | Orion | 7:27.11 |
| 4 | 7 | Bruce Dee | 13 | S6 | Northampton | 7:05.29 |
| 5 | 6 | Giacomo Fatica | 13 | S9 | Swindon Dolp | 7:06.61 |
| 6 | 4 | Joel Hales-Waller | 17 | S8 | Blythe Barra | 7:32.08 |
| 7 | 2 | James Garry | 17 | S9 | Mildenhall | 8:50.87 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 9 | Jack Coulam | 13 | S10 | Bridlington | 6:55.93 |
| 2 | 11 | Nathaniel Costigan | 19 | S12 | Satellite | 6:18.10 |
| 3 | 13 | Benny Romberg | 13 | S10 | Kingston Roy | 6:15.09 |
| 4 | 15 | Leo Johnson | 26 | S8 | Out To Swim | 5:53.42 |
| 5 | 14 | Sam Downie | 13 | S9 | East Lothian | 5:54.45 |
| 6 | 12 | Sebastian Williams | 15 | S6 | Mt Kelly | 6:16.39 |
| 7 | 10 | Owen Say | 18 | S8 | Wycombe Dist | 6:20.47 |
| 8 | 8 | Jamie Markall | 16 | S8 | Orion | 6:59.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 17 | Matthew Davies | 15 | S9 | RomseyTotton | 5:50.39 |
| 2 | 19 | Leo McCrea | 16 | S6 | Bourmth Coll | 5:47.39 |
| 3 | 21 | William Perry | 19 | S6 | Northampton | 5:38.67 |
| 4 | 23 | Zack Sturgess | 12 | S10 | S Bournem'th | 5:29.94 |
| 5 | 22 | Sam Bradley | 26 | S7 | Team Luton | 5:32.08 |
| 6 | 20 | Patrick Flanagan | 22 | S6 | Ireland | 5:39.13 |
| 7 | 18 | Toben Durrant | 14 | S13 | Co Cardiff | 5:49.91 |
| 8 | 16 | Cameron Hemphill | 16 | S10 | Carnegie | 5:53.28 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 25 | Balthazar Bradshaw | 13 | S10 | Brompton | 5:21.48 |
| 2 | 27 | Kyle Hughes | 18 | S9 | Motherwell W | 5:08.65 |
| 3 | 29 | Tom Piggott | 19 | S10 | Swansea Uni | 4:56.51 |
| 4 | 31 | Michael Jones | 25 | S7 | Co Manch Aq | 4:49.45 |
| 5 | 30 | Jonathan McGrath | 26 | S8 | Ireland | 4:53.20 |
| 6 | 28 | Luke Batty | 14 | S9 | Bolton Metro | 5:06.00 |
| 7 | 26 | Scott Hadley | 21 | S8 | Orion | 5:21.05 |
| 8 | 24 | Maximilian Tulloch | 14 | S9 | Chalfont | 5:24.33 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 33 | Sean O'Riordan | 20 | S13 | Ireland | 4:44.07 |
| 2 | 35 | Kieran Williams | 15 | S10 | Newquay | 4:34.02 |
| 3 | 37 | Oliver Hynd | 25 | S9 | Nova Cent'n | 4:23.86 |
| 4 | 39 | Lewis White | 19 | S9 | Co Manch Aq | 4:17.27 |
| 5 | 38 | Oliver Carter | 19 | S10 | UniOfStirl | 4:19.63 |
| 6 | 36 | Jacob Leach | 19 | S9 | Cockermouth | 4:32.81 |
| 7 | 34 | Benjamin Grainger | 16 | S10 | Mt Kelly | 4:36.59 |
| 8 | 32 | James Brown | 17 | S9 | Royal Wolv | 4:45.12 |