EVENT 301 Mens MC 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 2 | 2 | Bruce Dee | 12 | S6 | Northampton | 8:12.52 |
| 3 | 4 | James Watson | 14 | S8 | Harrogate | 7:28.36 |
| 4 | 6 | Jamie Markall | 15 | S8 | Orion | 7:08.83 |
| 5 | 5 | Xander Harris | 14 | S6 | Devonport | 7:18.30 |
| 6 | 3 | Sebastian Williams | 14 | S6 | Mt Kelly | 7:32.62 |
| 7 | 1 | James Garry | 16 | S9 | Mildenhall | 9:08.53 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 8 | Cameron Connelly | 13 | S9 | Putteridge | 7:06.46 |
| 2 | 10 | Benny Romberg | 12 | S10 | Kingston Roy | 6:48.17 |
| 3 | 12 | Sam Downie | 12 | S9 | Musselburgh | 6:28.64 |
| 4 | 14 | Alexander Taylor | 17 | S10 | Harrogate | 5:59.00 |
| 5 | 13 | Nathaniel Costigan | 18 | S12 | Satellite | 6:18.57 |
| 6 | 11 | Jacob Chambers | 15 | S8 | Co Manch Aq | 6:28.88 |
| 7 | 9 | William Whitehead | 13 | S8 | Rotherham Mo | 7:02.03 |
| 8 | 7 | Alexander Hobbs | 13 | S7 | Mt Kelly | 7:08.17 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 16 | Leo McCrea | 15 | S6 | Bourmth Coll | 5:49.41 |
| 2 | 18 | Rhys Gill | 16 | S9 | Ythan | 5:41.69 |
| 3 | 20 | Balthazar Bradshaw | 12 | S10 | Brompton | 5:37.36 |
| 4 | 22 | Adam Donnachie | 18 | S8 | Eastkilbride | 5:26.04 |
| 5 | 21 | Maximilian Tulloch | 13 | S9 | Chalfont | 5:36.98 |
| 6 | 19 | Patrick Flanagan | 21 | S6 | Ireland | 5:38.73 |
| 7 | 17 | Cameron Hemphill | 15 | S10 | Carnegie | 5:47.27 |
| 8 | 15 | Benjamin Pope | 14 | S8 | Havant & Wat | 5:49.74 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 24 | Reilly Shanahan | 18 | S9 | Shrewsbury | 5:24.84 |
| 2 | 26 | Connor Boyfield | 20 | S9 | Boston | 5:19.48 |
| 3 | 28 | Charlie Coulam | 15 | S10 | Bridlington | 5:08.73 |
| 4 | 30 | Jonathan McGrath | 25 | S8 | Ireland | 4:58.80 |
| 5 | 29 | Sean O'Riordan | 19 | S13 | Ireland | 4:59.15 |
| 6 | 27 | Scott Hadley | 20 | S8 | Orion | 5:18.97 |
| 7 | 25 | Kyle Hughes | 17 | S9 | Motherwell W | 5:19.63 |
| 8 | 23 | Luke Batty | 13 | S9 | Bolton Metro | 5:25.21 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Cat | Club/Country | Time |
| 1 | 32 | James Brown | 16 | S9 | Royal Wolv | 4:53.16 |
| 2 | 34 | Michael Jones | 24 | S7 | Co Manch Aq | 4:48.54 |
| 3 | 36 | Benjamin Grainger | 15 | S10 | Mt Kelly | 4:39.90 |
| 4 | 38 | Lewis White | 18 | S9 | Co Manch Aq | 4:11.26 |
| 5 | 37 | Oliver Carter | 18 | S10 | Carnegie | 4:21.85 |
| 6 | 35 | Kieran Williams | 14 | S10 | Newquay | 4:46.77 |
| 7 | 33 | Dominic Redpath | 16 | S9 | Portsmouth N | 4:50.39 |
| 8 | 31 | Tom Piggott | 18 | S10 | Oswestry Ott | 4:54.73 |