EVENT 111 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 1 | Charles Hazell | 14 | Rushmoor Ryl | 5:05.72 |
| 2 | 3 | Donatus Dragasius | 14 | Camden Swiss | 5:05.54 |
| 3 | 5 | Arthur Llewellyn | 14 | Bo Stockton | 5:04.96 |
| 4 | 7 | Joshua Weston | 14 | Wycombe Dist | 5:04.55 |
| 5 | 6 | Matthew Hargreaves | 14 | Co Birm'ham | 5:04.93 |
| 6 | 4 | Samuel Ridgley | 14 | Dulwich Dolp | 5:05.20 |
| 7 | 2 | Adam Barrett | 14 | Gates &Whick | 5:05.55 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 9 | Pietro Ubertalli | 14 | Natare W Lon | 5:03.86 |
| 1 | 11 | Rafe Dobson | 14 | Co Milton K | 5:03.41 |
| 2 | 13 | Oscar Miles | 14 | Thanet Swim | 5:03.05 |
| 3 | 15 | William Baines | 13 | Bo Stockton | 5:02.83 |
| 4 | 17 | Jake Reynolds | 14 | Bolton Metro | 5:02.14 |
| 5 | 16 | Harvey Quiddington | 14 | Barnet Copt | 5:02.71 |
| 6 | 14 | Ellis Cleworth | 14 | Co Liverpool | 5:02.94 |
| 7 | 12 | Kaiden Welsby | 13 | Stockport Mo | 5:03.32 |
| 8 | 10 | Evan Jones | 14 | Millfield | 5:03.83 |
| 9 | 8 | Liam Dawson | 13 | Nova Cent'n | 5:04.16 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 19 | Nicholas Botha | 16 | Bishop Stort | 4:59.76 |
| 1 | 21 | Matthew Rothwell | 16 | Co Peterboro | 4:59.11 |
| 2 | 23 | Jamie Dark | 15 | Co Birm'ham | 4:58.73 |
| 3 | 25 | Oliver Nevitt | 16 | Lincoln Vulc | 4:58.20 |
| 4 | 27 | Casper Raynard | 16 | Derventio | 4:57.84 |
| 5 | 26 | Andrew Hall | 15 | Nova Cent'n | 4:58.10 |
| 6 | 24 | Maximillian Bolcato | 16 | Co Oxford | 4:58.65 |
| 7 | 22 | Samuel Rose | 15 | West Norfolk | 4:59.09 |
| 8 | 20 | Ethan Wright | 16 | Winsford | 4:59.65 |
| 9 | 18 | Mason Bland | 14 | KingstonHull | 5:02.04 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 29 | Thomas Davidson | 16 | Wolv'hampton | 4:57.50 |
| 1 | 31 | Daniel Gencas | 15 | Romford Town | 4:56.92 |
| 2 | 33 | Xeimon Parker-Cox | 16 | Leic Sharks | 4:56.43 |
| 3 | 35 | Joshua Skinner | 15 | Nova Cent'n | 4:55.96 |
| 4 | 37 | Samuel Coulthard | 15 | Southport | 4:55.57 |
| 5 | 36 | Benjamin Havers-Strong | 15 | Burnley BOBC | 4:55.94 |
| 6 | 34 | Jay Cushen | 15 | Winsford | 4:56.06 |
| 7 | 32 | Cade Darby | 16 | Middlesboro | 4:56.48 |
| 8 | 30 | Ben Penhale | 15 | TauntonDeane | 4:57.37 |
| 9 | 28 | Jack Howard | 16 | Preston | 4:57.69 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 39 | Joshua Press | 15 | Co Milton K | 4:55.30 |
| 1 | 41 | Dillon Chana | 15 | Hillingdon | 4:54.95 |
| 2 | 43 | Ryan Huddart | 17 | Derventio | 4:54.76 |
| 3 | 45 | Timothy Leberl | 16 | Beckenham | 4:54.42 |
| 4 | 47 | Benjamin Foster | 16 | Stockport Mo | 4:54.06 |
| 5 | 46 | Adam Jones | 15 | Co Manch Aq | 4:54.08 |
| 6 | 44 | Kieran Summers | 15 | N Lincs SS | 4:54.68 |
| 7 | 42 | Nicholas Sims | 17 | Wycombe Dist | 4:54.91 |
| 8 | 40 | Alexander Everson | 16 | KingstonHull | 4:55.25 |
| 9 | 38 | Alexander Sargeant | 16 | Millfield | 4:55.46 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 49 | Kieran Dale | 16 | Thanet Swim | 4:53.68 |
| 1 | 51 | Patrick Mahney | 15 | Northampton | 4:53.13 |
| 2 | 53 | Benjamin Shipley | 16 | KingstonHull | 4:52.83 |
| 3 | 55 | Kai Ogden | 15 | Hackney | 4:52.56 |
| 4 | 57 | Thomas Menlove | 17 | Winchester | 4:52.12 |
| 5 | 56 | James Bartley | 15 | Mt Kelly | 4:52.48 |
| 6 | 54 | Charles Hallett | 17 | Guernsey | 4:52.71 |
| 7 | 52 | Piers Bowden | 17 | Wycombe Dist | 4:52.89 |
| 8 | 50 | Samuel Wardle | 17 | Co Bradford | 4:53.15 |
| 9 | 48 | Andre Strydom | 16 | RTW Monson | 4:53.70 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 59 | Bailey Hairsine | 19 | Co Manch Aq | 4:51.09 |
| 1 | 61 | Christopher Wood | 19 | Co Oxford | 4:50.30 |
| 2 | 63 | Max Underwood | 17 | Co Oxford | 4:50.11 |
| 3 | 65 | Samuel Taylor | 18 | Co Manch Aq | 4:49.35 |
| 4 | 67 | Segev Gonen Cohen | 18 | Camden Swiss | 4:49.24 |
| 5 | 66 | Ryan Kelly | 19 | Chelmsford | 4:49.27 |
| 6 | 64 | Harry Whiteman | 18 | Co Peterboro | 4:50.08 |
| 7 | 62 | William McIntyre | 21 | Loughboro Un | 4:50.27 |
| 8 | 60 | Ben Gilchrist | 17 | Durham City | 4:50.91 |
| 9 | 58 | Willem Koster | 16 | Dulwich Dolp | 4:52.10 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 70 | Lewis Smart | 17 | Mt Kelly | 4:48.10 |
| 1 | 74 | Reuben Alexander | 19 | Bracknell | 4:47.46 |
| 2 | 78 | Joel Weston | 18 | Co Leicester | 4:46.57 |
| 3 | 82 | Liam Snook | 20 | Northampton | 4:45.77 |
| 4 | 86 | Liam Birrell | 17 | Co Leeds | 4:44.40 |
| 5 | 84 | Alex Crossland-Robins | 18 | Stockport Mo | 4:44.72 |
| 6 | 80 | Elliot Pickford | 18 | Wirral Metro | 4:46.30 |
| 7 | 76 | Christian Tai | 17 | Bourmth Coll | 4:47.19 |
| 8 | 72 | Miles Drabwell | 17 | Co Milton K | 4:47.78 |
| 9 | 68 | Aron Preece | 19 | Wrekin Coll | 4:48.28 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 71 | Billy Pettit | 17 | Ellesmere Co | 4:47.90 |
| 1 | 75 | Matthew Rogers | 18 | Bromley | 4:47.36 |
| 2 | 79 | James Cross | 18 | Wigan BEST | 4:46.42 |
| 3 | 83 | Jay Manners | 19 | Co Sund'land | 4:45.41 |
| 4 | 87 | Jacob M Joergensen | 21 | Kvik Kastrup | 4:26.36 |
| 5 | 85 | Jack Buswell | 17 | Northampton | 4:44.58 |
| 6 | 81 | Adam Law | 17 | Bo Kirklees | 4:45.77 |
| 7 | 77 | Samuel Naylor | 18 | Co Bradford | 4:47.04 |
| 8 | 73 | Samuel Neeld | 18 | Wrekin Coll | 4:47.69 |
| 9 | 69 | Luke Bryan | 18 | West Norfolk | 4:48.13 |