EVENT 205 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Nathan Woodrow | 14 | Co Norwich | 4:56.98 |
| 4 | 3 | Patrick Mahney | 14 | Northampton | 4:56.94 |
| 5 | 2 | Luke Adams | 15 | Co Salford | 4:56.94 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 5 | Ross Philp | 15 | Staines | 4:56.75 |
| 1 | 7 | George Rudd | 15 | Co Oxford | 4:56.51 |
| 2 | 9 | Timothy Leberl | 15 | Beckenham | 4:56.24 |
| 3 | 11 | Reid Jones | 15 | Plymouth Lea | 4:55.86 |
| 4 | 13 | Dominic Bools | 14 | Nova Cent'n | 4:54.44 |
| 5 | 12 | Jordon McPhail | 14 | Guildford Ct | 4:55.75 |
| 6 | 10 | Thomas White | 15 | Nova Cent'n | 4:56.06 |
| 7 | 8 | Kenji McDade | 15 | Maxwell | 4:56.28 |
| 8 | 6 | James Bartley | 14 | Mt Kelly | 4:56.74 |
| 9 | 4 | Elijah Kendrick | 13 | Shiverers | 4:56.83 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 15 | Henry Pearce | 15 | Co Peterboro | 4:53.55 |
| 1 | 17 | Edward Hunt | 14 | Teddington | 4:52.55 |
| 2 | 19 | Billy Wotton | 14 | Ellesmere Co | 4:51.75 |
| 3 | 21 | Joseph Deighan | 14 | Stockport Mo | 4:51.54 |
| 4 | 23 | Oliver Fairman | 15 | Poole | 4:51.11 |
| 5 | 22 | Pietro Forconi | 14 | Winchester | 4:51.21 |
| 6 | 20 | Alex Rosser-Barnett | 14 | Ellesmere Co | 4:51.69 |
| 7 | 18 | Jolan Bennett | 14 | Stockport Mo | 4:52.49 |
| 8 | 16 | Matthew Yeomans | 15 | Co Leeds | 4:53.36 |
| 9 | 14 | Thomas Beamer | 15 | Co Leicester | 4:54.36 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 25 | Joseph Russell | 15 | Mt Kelly | 4:50.92 |
| 1 | 27 | Joseph Kingsland | 14 | Nova Cent'n | 4:50.25 |
| 2 | 29 | Ryan Wilcox | 15 | Nova Cent'n | 4:48.68 |
| 3 | 31 | William Ellington | 14 | Millfield | 4:46.68 |
| 4 | 33 | Pierce Greening | 14 | Cockermouth | 4:45.69 |
| 5 | 32 | Reuben Visda | 14 | Co Sheffield | 4:46.55 |
| 6 | 30 | Ethan McNeil | 15 | Team Bath AS | 4:47.15 |
| 7 | 28 | Herbie Kinder | 15 | Co Peterboro | 4:49.21 |
| 8 | 26 | Luke Skelding | 15 | Co Derby | 4:50.31 |
| 9 | 24 | William Earl | 15 | Co Sheffield | 4:50.96 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 35 | Edward Mildred | 14 | Northampton | 4:41.70 |
| 1 | 37 | Joshua Harris | 16 | Nova Cent'n | 4:40.61 |
| 2 | 39 | Jasper Lye | 18 | Co Bristol | 4:40.15 |
| 3 | 41 | Lewis Gilchrist | 17 | Co Oxford | 4:39.25 |
| 4 | 43 | Gregory Butler | 17 | Co Derby | 4:38.74 |
| 5 | 42 | Augustus Veasey | 21 | Basildon Ph | 4:38.87 |
| 6 | 40 | Yaron Gerber | 19 | Barnet Copt | 4:39.49 |
| 7 | 38 | Caleb Mackey | 18 | Grantham | 4:40.33 |
| 8 | 36 | Jacob Davies | 15 | Co Birm'ham | 4:40.82 |
| 9 | 34 | Jackson O'Rourke | 15 | Northampton | 4:45.08 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 46 | Oliver O'Halleron | 17 | Derwentside | 4:38.33 |
| 1 | 50 | Alfie Kelly | 16 | Newcastle | 4:33.68 |
| 2 | 54 | Nathan Wells | 19 | Loughboro Un | 4:29.68 |
| 3 | 58 | Fraser Minnican | 22 | Loughboro Un | 4:22.31 |
| 4 | 62 | Thomas Dean | 17 | Maidenhead | 4:20.20 |
| 5 | 60 | Brodie Williams | 18 | Millfield | 4:20.64 |
| 6 | 56 | Thomas Paine | 23 | Co Manch Aq | 4:26.66 |
| 7 | 52 | William Bell | 15 | Co Leicester | 4:31.55 |
| 8 | 48 | Samuel Goldrick | 19 | Co Manch Aq | 4:37.16 |
| 9 | 44 | James Newman | 15 | Co Leicester | 4:38.68 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 47 | William Slawson | 20 | Wrekin Coll | 4:37.52 |
| 1 | 51 | Adam Wilson | 16 | Newcastle | 4:32.34 |
| 2 | 55 | Zak Logue | 19 | Co Sund'land | 4:27.43 |
| 3 | 59 | Jacob Greenow | 18 | Bath Univ | 4:22.20 |
| 4 | 63 | Joe Litchfield | 19 | Co Sheffield | 4:19.15 |
| 5 | 61 | Nathan Hughes | 17 | Hatfield | 4:20.59 |
| 6 | 57 | John Britton | 22 | Ealing | 4:25.06 |
| 7 | 53 | Caleb Hughes | 22 | Loughboro Un | 4:30.50 |
| 8 | 49 | Ben Harrison | 17 | Mt Kelly | 4:33.83 |
| 9 | 45 | James Woodward | 17 | Hatfield | 4:38.38 |