EVENT 308 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 2 | 1 | Dillon Chana | 14 | Hillingdon | 5:00.25 |
| 3 | 3 | Elijah Kendrick | 13 | Shiverers | 4:59.77 |
| 4 | 5 | Harrison Barber | 14 | Biddulph | 4:59.40 |
| 5 | 4 | Lewis Maxwell | 14 | Derwentside | 4:59.49 |
| 6 | 2 | Patrick Mahney | 14 | Northampton | 4:59.79 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 7 | Reuben Visda | 14 | Co Sheffield | 4:58.10 |
| 1 | 9 | Jordon McPhail | 14 | Guildford Ct | 4:57.52 |
| 2 | 11 | James Bartley | 14 | Co Leicester | 4:56.74 |
| 3 | 13 | Kieran Summers | 14 | Scunthorpe A | 4:56.47 |
| 4 | 15 | Andre Strydom | 15 | RTW Monson | 4:55.95 |
| 5 | 14 | Daniel Butler | 15 | Newcastle | 4:56.30 |
| 6 | 12 | Zachariah Speakman | 15 | Nofio Clwyd | 4:56.65 |
| 7 | 10 | Pietro Lombardo | 14 | Ealing | 4:57.48 |
| 8 | 8 | Nicholas Skelton | 14 | Co Oxford | 4:57.89 |
| 9 | 6 | Nathan Woodrow | 14 | UEA Norwich | 4:58.99 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 17 | Jolan Bennett | 14 | Stockport Mo | 4:55.85 |
| 1 | 19 | Dominic Bools | 14 | Nova Cent'n | 4:54.44 |
| 2 | 21 | Huw Williams | 15 | Millfield | 4:54.33 |
| 3 | 23 | Kieran Dale | 15 | Thanet Swim | 4:54.25 |
| 4 | 25 | Liam Brennan | 15 | Basildon Ph | 4:53.62 |
| 5 | 24 | Oliver Fairman | 15 | S Bournem'th | 4:53.65 |
| 6 | 22 | Jason Robson | 14 | York City | 4:54.25 |
| 7 | 20 | Thomas Beamer | 15 | Strat Sharks | 4:54.36 |
| 8 | 18 | Andrew Arthur | 15 | Aberdeen Per | 4:55.36 |
| 9 | 16 | William Ellington | 14 | Millfield | 4:55.89 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 27 | Angus Allison | 14 | Inverleith | 4:53.27 |
| 1 | 29 | Ryan Wilcox | 15 | Nova Cent'n | 4:52.44 |
| 2 | 31 | Joseph Kingsland | 14 | Nova Cent'n | 4:52.08 |
| 3 | 33 | Herbie Kinder | 15 | Co Peterboro | 4:51.83 |
| 4 | 35 | Ethan McNeil | 15 | Team Bath AS | 4:50.34 |
| 5 | 34 | Joseph Russell | 15 | Mt Kelly | 4:50.92 |
| 6 | 32 | Lewis Binning | 14 | Romford Town | 4:52.02 |
| 7 | 30 | Rory Dickson | 15 | N Ayrshire | 4:52.14 |
| 8 | 28 | Matthew Broughton | 14 | Co Lincoln P | 4:53.26 |
| 9 | 26 | Henry Pearce | 15 | Co Peterboro | 4:53.55 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 37 | Calum Chittleburgh | 16 | Warrender Ba | 4:49.63 |
| 1 | 39 | Harvey Jones | 16 | Stockport Mo | 4:48.72 |
| 2 | 41 | Pierce Greening | 14 | Cockermouth | 4:48.48 |
| 3 | 43 | James Newman | 15 | Co Leicester | 4:48.43 |
| 4 | 45 | Alexander Borisov | 16 | Camden Swiss | 4:47.87 |
| 5 | 44 | Jacob Davies | 15 | Co Birm'ham | 4:48.11 |
| 6 | 42 | Liam Birrell | 16 | Co Leeds | 4:48.46 |
| 7 | 40 | Edward Mildred | 14 | Northampton | 4:48.58 |
| 8 | 38 | Hector Pardoe | 16 | Ellesmere Co | 4:49.08 |
| 9 | 36 | Jack Buswell | 16 | Northampton | 4:49.85 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 47 | James Bilbao | 16 | Co Hereford | 4:47.61 |
| 1 | 49 | Adam Davies | 16 | Plymouth Lea | 4:46.82 |
| 2 | 51 | Matthew Richards | 15 | Royal Wolv | 4:46.44 |
| 3 | 53 | Joshua Harris | 16 | Nova Cent'n | 4:45.66 |
| 4 | 55 | Jackson O'Rourke | 15 | Northampton | 4:45.08 |
| 5 | 54 | Ioan Evans | 15 | Co Cardiff | 4:45.44 |
| 6 | 52 | Jonathan Milner | 16 | Co Leeds | 4:45.84 |
| 7 | 50 | James Macdonald | 16 | Warrender Ba | 4:46.62 |
| 8 | 48 | Ben Cope | 16 | Royal Wolv | 4:47.59 |
| 9 | 46 | Joel Lange | 16 | Maidenhead | 4:47.64 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 57 | Christy Moon | 17 | Chelsea&West | 4:43.18 |
| 1 | 59 | Daniel Ferguson | 16 | West Lothian | 4:42.80 |
| 2 | 61 | Robbie Jones | 16 | TigersJersey | 4:42.15 |
| 3 | 63 | Adam Brown | 18 | Millfield | 4:40.90 |
| 4 | 65 | Oliver O'Halleron | 17 | Derwentside | 4:40.37 |
| 5 | 64 | R Ormonde-Cunningham | 19 | Mt Kelly | 4:40.81 |
| 6 | 62 | Yaron Gerber | 19 | Barnet Copt | 4:41.53 |
| 7 | 60 | Archie Plowman | 16 | Northampton | 4:42.62 |
| 8 | 58 | Max Jameson | 17 | Thanet Swim | 4:42.96 |
| 9 | 56 | Leo Karski | 16 | Boldmere | 4:44.99 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 67 | Alfie Kelly | 16 | Newcastle | 4:39.69 |
| 1 | 69 | Michael Rees | 17 | Sutton Cheam | 4:38.92 |
| 2 | 71 | Joel Thompson | 16 | Shiverers | 4:38.39 |
| 3 | 73 | Ben Harrison | 17 | Mt Kelly | 4:37.06 |
| 4 | 75 | Nathan Wells | 19 | Loughboro Un | 4:36.44 |
| 5 | 74 | Matthew George | 17 | Co Salford | 4:36.67 |
| 6 | 72 | William Slawson | 20 | Wrekin Coll | 4:37.52 |
| 7 | 70 | Augustus Veasey | 21 | Basildon Ph | 4:38.87 |
| 8 | 68 | Ryan Brown | 19 | Co Glasgow | 4:39.19 |
| 9 | 66 | Caleb Mackey | 18 | Grantham | 4:40.33 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 78 | Rubens King | 20 | Portsmouth N | 4:34.59 |
| 1 | 82 | Richard Mawson | 18 | Co Leeds | 4:33.51 |
| 2 | 86 | Joseph Miley | 20 | Aberdeen Per | 4:32.17 |
| 3 | 90 | Thomas Paine | 23 | Co Manch Aq | 4:27.12 |
| 4 | 94 | Brodie Williams | 18 | Millfield | 4:20.89 |
| 5 | 92 | Jacob Greenow | 18 | TauntonDeane | 4:22.64 |
| 6 | 88 | Craig Munden | 20 | Loughboro Un | 4:29.32 |
| 7 | 84 | Adam Wilson | 16 | Newcastle | 4:32.34 |
| 8 | 80 | Fraser Allison | 17 | Warrender Ba | 4:33.89 |
| 9 | 76 | Jakob Goodman | 17 | Millfield | 4:35.85 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 79 | Alastair Miley | 23 | Aberdeen Per | 4:34.29 |
| 1 | 83 | John Britton | 22 | Ealing | 4:33.27 |
| 2 | 87 | Tony-Joe Trett Oliver | 18 | Mt Kelly | 4:31.80 |
| 3 | 91 | Callum Lawrie | 19 | UniOfStirl | 4:24.28 |
| 4 | 95 | Nathan Hughes | 17 | Loughboro NC | 4:20.84 |
| 5 | 93 | Fraser Minnican | 22 | Loughboro Un | 4:22.31 |
| 6 | 89 | Zak Logue | 19 | Co Sund'land | 4:27.83 |
| 7 | 85 | Ryan Retson | 17 | F.I.R.S.T. | 4:32.32 |
| 8 | 81 | Marcus Dey | 16 | Co Salford | 4:33.59 |
| 9 | 77 | Kieran Wheatley | 18 | Co Derby | 4:35.07 |