EVENT 202 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 2 | Kai Ogden | 16 | Hackney | 4:38.89 |
| 2 | 4 | James Hart | 15 | Plymouth Lea | 4:38.74 |
| 3 | 6 | Daniel Gencas | 16 | Romford Town | 4:38.63 |
| 4 | 8 | Liam Dawson | 14 | Nova Cent'n | 4:37.50 |
| 5 | 7 | Tom Barden | 16 | Mt Kelly | 4:38.59 |
| 6 | 5 | Evan Jones | 15 | Millfield | 4:38.71 |
| 7 | 3 | Ellis Cleworth | 15 | Co Liverpool | 4:38.79 |
| 8 | 1 | Ryan Griffiths | 16 | Co Coventry | 4:38.99 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 10 | Elijah Kendrick | 15 | Shiverers | 4:36.91 |
| 1 | 12 | Joshua Press | 16 | Co Milton K | 4:36.48 |
| 2 | 14 | Teilo Crow | 16 | Co Bristol | 4:36.03 |
| 3 | 16 | Igor Shuvalov | 16 | Plymouth Lea | 4:35.74 |
| 4 | 18 | Dalton Clapham | 16 | Co Leeds | 4:35.35 |
| 5 | 17 | R Rowbotham-Keating | 14 | Co Manch Aq | 4:35.55 |
| 6 | 15 | Matthew Woodhall | 15 | Co Sheffield | 4:35.87 |
| 7 | 13 | Edward Whittles | 13 | Chelsea&West | 4:36.33 |
| 8 | 11 | Lewis Binning | 16 | Basildon Ph | 4:36.75 |
| 9 | 9 | Jolan Bennett | 16 | Stockport Mo | 4:37.34 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Daniel Kennedy | 15 | Co Leicester | 4:34.61 |
| 1 | 22 | Jack Smith | 15 | Cockermouth | 4:34.37 |
| 2 | 24 | Jan Poulton | 15 | Wycombe Dist | 4:33.44 |
| 3 | 26 | Thomas White | 17 | Nova Cent'n | 4:32.59 |
| 4 | 28 | Joseph Kingsland | 16 | Nova Cent'n | 4:31.71 |
| 5 | 27 | Jamie Owen | 17 | Wycombe Dist | 4:31.77 |
| 6 | 25 | Joshua Weston | 15 | Wycombe Dist | 4:33.29 |
| 7 | 23 | Theodore Thompson | 16 | Mt Kelly | 4:34.29 |
| 8 | 21 | Edward Hunt | 16 | Kingston Roy | 4:34.54 |
| 9 | 19 | James Bartley | 16 | Mt Kelly | 4:35.20 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 30 | Thomas Beamer | 17 | Co Leicester | 4:31.18 |
| 1 | 32 | Samuel Peck | 19 | Co Cambridge | 4:30.67 |
| 2 | 34 | Ethan Hansen | 17 | Mt Kelly | 4:30.05 |
| 3 | 36 | Kenji McDade | 17 | Co Oxford | 4:29.81 |
| 4 | 38 | Herbie Kinder | 17 | Co Peterboro | 4:29.26 |
| 5 | 37 | Pierce Greening | 16 | Cockermouth | 4:29.27 |
| 6 | 35 | Luke Ibbeson | 16 | Wycombe Dist | 4:29.85 |
| 7 | 33 | Davide Arioli | 17 | Millfield | 4:30.21 |
| 8 | 31 | Charles Kershaw | 17 | Plymouth Lea | 4:30.83 |
| 9 | 29 | James Bilbao | 18 | Co Manch Aq | 4:31.64 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 41 | Reuben Visda | 16 | Co Sheffield | 4:27.90 |
| 1 | 45 | Hector Pardoe | 18 | Ellesmere Co | 4:26.66 |
| 2 | 49 | John Britton | 24 | Ealing | 4:25.18 |
| 3 | 53 | Max Murphy | 19 | Loughboro Un | 4:21.32 |
| 4 | 57 | Matthew Domville | 22 | Warrington W | 4:19.04 |
| 5 | 55 | Jonathan Milner | 18 | Co Manch Aq | 4:20.03 |
| 6 | 51 | Michael Rees | 19 | Nova Cent'n | 4:24.05 |
| 7 | 47 | William Slawson | 22 | Wrekin Coll | 4:25.98 |
| 8 | 43 | Jackson O'Rourke | 17 | Northampton | 4:27.57 |
| 9 | 39 | Matthew Rogers | 19 | Birm'ham Uni | 4:29.19 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 42 | Charles Hallett | 18 | Guernsey | 4:27.88 |
| 1 | 46 | R Ormonde-Cunningham | 21 | Loughboro Un | 4:26.36 |
| 2 | 50 | Cameron Brooker | 17 | Wycombe Dist | 4:24.26 |
| 3 | 54 | Nathan Wells | 21 | Loughboro Un | 4:20.57 |
| 4 | 58 | Thomas Paine | 25 | Co Manch Aq | 4:16.03 |
| 5 | 56 | William Bell | 17 | Co Leicester | 4:19.91 |
| 6 | 52 | Robbie Jones | 18 | Mt Kelly | 4:23.98 |
| 7 | 48 | Ben Harrison | 19 | Loughboro Un | 4:25.20 |
| 8 | 44 | Myles Turner | 19 | West Suffolk | 4:27.07 |
| 9 | 40 | Aron Preece | 20 | Nova Cent'n | 4:28.09 |