EVENT 111 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | William Reeves | 14 | Thanet Swim | 5:08.33 |
| 4 | 3 | Albert Branch | 14 | Black Lion | 5:07.80 |
| 5 | 2 | Conor Cherrington | 13 | S Bournem'th | 5:08.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 5 | Finley Bunhejee | 14 | Co Derby | 5:06.30 |
| 2 | 7 | James Cummings-Candal | 14 | Portsmouth N | 5:05.73 |
| 3 | 9 | Cameron Carlos | 14 | Barnet Copt | 5:05.58 |
| 4 | 11 | Oliver Covill | 14 | Ellesmere Co | 5:05.11 |
| 5 | 10 | George Chapman | 14 | Lancing Col | 5:05.13 |
| 6 | 8 | James Robinson | 14 | Co Leeds | 5:05.66 |
| 7 | 6 | James Clay | 14 | West Suffolk | 5:05.84 |
| 8 | 4 | Oscar Bilbao | 13 | Co Hereford | 5:07.41 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 13 | Oliver Jones | 14 | Ledbury | 5:04.77 |
| 1 | 15 | Anthony Whittall | 14 | Co Manch Aq | 5:04.13 |
| 2 | 17 | Alexander Cook | 14 | Guildford Ct | 5:03.41 |
| 3 | 19 | Elliot Sibley | 14 | Nova Cent'n | 5:03.08 |
| 4 | 21 | Andrew Bertoli | 15 | Bramcote | 4:57.80 |
| 5 | 20 | Charlie Broome | 15 | Co Leeds | 4:58.03 |
| 6 | 18 | Max Shaw | 14 | Co Milton K | 5:03.41 |
| 7 | 16 | Henry Halloran-Day | 14 | Portsmouth N | 5:03.92 |
| 8 | 14 | Alexander Williams | 14 | Hillingdon | 5:04.38 |
| 9 | 12 | Peter Soczewka | 14 | Hatfield | 5:05.04 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 23 | Rhys Davidson | 15 | Team Luton | 4:57.40 |
| 1 | 25 | Thomas Storer | 16 | Newcastle | 4:57.08 |
| 2 | 27 | Archie Minto | 16 | Skipton | 4:57.06 |
| 3 | 29 | Donatas Dragasius | 15 | Camden Swiss | 4:56.65 |
| 4 | 31 | Max Adams | 15 | Co Salford | 4:56.18 |
| 5 | 30 | Oliver Bedworth | 16 | Guildford Ct | 4:56.53 |
| 6 | 28 | Jake Reynolds | 15 | Pioneer 79 | 4:56.93 |
| 7 | 26 | Jacob Papple | 16 | Bo Stockton | 4:57.08 |
| 8 | 24 | Harry Milner | 15 | Co Leeds | 4:57.17 |
| 9 | 22 | Oscar Miles | 15 | Thanet Swim | 4:57.66 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 33 | Joe Cooper | 15 | teamipswich | 4:55.82 |
| 1 | 35 | Oliver Taylor | 15 | Co Manch Aq | 4:55.14 |
| 2 | 37 | Dominik Strba | 16 | Crawley | 4:55.03 |
| 3 | 39 | Jamie Dark | 16 | Boldmere | 4:54.81 |
| 4 | 41 | James Woods | 15 | Middlesboro | 4:54.36 |
| 5 | 40 | Nicholas Reid | 17 | Wycombe Dist | 4:54.54 |
| 6 | 38 | Charles Hazell | 15 | Rushmoor Ryl | 4:54.86 |
| 7 | 36 | Luke Jeal | 16 | Leic Sharks | 4:55.12 |
| 8 | 34 | Jack Turrell | 16 | Basildon Ph | 4:55.63 |
| 9 | 32 | Matthew Hargreaves | 15 | Mt Kelly | 4:56.00 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 43 | Joshua Press | 16 | Co Milton K | 4:54.30 |
| 1 | 45 | Tom Barden | 16 | Hailsham | 4:53.85 |
| 2 | 47 | Thomas Poulton | 17 | Wycombe Dist | 4:53.47 |
| 3 | 49 | Harvey Quiddington | 15 | Barnet Copt | 4:53.05 |
| 4 | 51 | Yann Divet | 16 | Camden Swiss | 4:52.77 |
| 5 | 50 | Luke Adams | 17 | Co Salford | 4:52.96 |
| 6 | 48 | Tom Mitchell | 17 | Co Coventry | 4:53.16 |
| 7 | 46 | Aslak Varela | 16 | Plymouth Lea | 4:53.56 |
| 8 | 44 | Andrew Hall | 16 | Nova Cent'n | 4:54.07 |
| 9 | 42 | Edward Pauling | 15 | Beckenham | 4:54.35 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 53 | Lewis Binning | 16 | Basildon Ph | 4:51.91 |
| 1 | 55 | Daniel Parsons | 16 | Royal Wolv | 4:51.32 |
| 2 | 57 | Patrick Mahney | 16 | Northampton | 4:51.25 |
| 3 | 59 | Joshua Fowles | 20 | Witham Dolph | 4:50.47 |
| 4 | 61 | Ryan Huddart | 18 | Derventio | 4:50.13 |
| 5 | 60 | Joshua Williams | 17 | Wycombe Dist | 4:50.35 |
| 6 | 58 | George Robinson | 19 | Preston | 4:51.04 |
| 7 | 56 | Alexander Woods | 16 | Grimsby AST | 4:51.29 |
| 8 | 54 | Matthew Yeomans | 17 | Co Leeds | 4:51.90 |
| 9 | 52 | Jolan Bennett | 16 | Stockport Mo | 4:52.50 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 63 | Charles Hallett | 18 | Guernsey | 4:49.61 |
| 1 | 65 | Luke Skelding | 17 | Royal Wolv | 4:49.14 |
| 2 | 67 | Aleksander Forysiak | 22 | Co Glasgow | 4:48.78 |
| 3 | 69 | Ryan Wilcox | 17 | Nova Cent'n | 4:48.44 |
| 4 | 71 | Thomas White | 17 | Nova Cent'n | 4:48.38 |
| 5 | 70 | Ben Gilchrist | 18 | Durham City | 4:48.42 |
| 6 | 68 | Charles Kershaw | 17 | Plymouth Lea | 4:48.65 |
| 7 | 66 | Kieran Dale | 17 | Thanet Swim | 4:48.97 |
| 8 | 64 | Liam Snook | 21 | Birm'ham Uni | 4:49.30 |
| 9 | 62 | Benjamin Foster | 17 | Stockport Mo | 4:50.04 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 74 | George Rudd | 17 | Co Oxford | 4:47.70 |
| 1 | 78 | Samuel Taylor | 19 | Co Manch Aq | 4:46.83 |
| 2 | 82 | Max Underwood | 18 | Co Oxford | 4:45.19 |
| 3 | 86 | Miles Drabwell | 18 | Co Milton K | 4:44.81 |
| 4 | 90 | Charlie Skalenda | 15 | Toronto CAN | 4:40.18 |
| 5 | 88 | Joseph Russell | 17 | Mt Kelly | 4:43.96 |
| 6 | 84 | Aron Preece | 20 | Nova Cent'n | 4:45.07 |
| 7 | 80 | Thomas Davidson | 17 | Wolv'hampton | 4:46.60 |
| 8 | 76 | James King | 19 | Weston S M | 4:47.18 |
| 9 | 72 | Ellis Stanhope | 17 | RTW Monson | 4:48.32 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 75 | Elliot Pickford | 19 | Co Manch Aq | 4:47.26 |
| 1 | 79 | Andre Strydom | 17 | RTW Monson | 4:46.76 |
| 2 | 83 | Harper Whitehead | 18 | Dane Valley | 4:45.11 |
| 3 | 87 | Samuel Goldrick | 21 | Oldham Aqua | 4:44.64 |
| 4 | 91 | Thomas Wheatcroft | 17 | Toronto CAN | 4:39.37 |
| 5 | 89 | Cyril Hanson Schleiper | 17 | Co Leicester | 4:43.44 |
| 6 | 85 | Jamie Owen | 17 | Wycombe Dist | 4:44.99 |
| 7 | 81 | Samuel Peck | 19 | Mt Kelly | 4:45.69 |
| 8 | 77 | Dylan Hood | 18 | Team Bath AS | 4:47.00 |
| 9 | 73 | Thomas Menlove | 18 | Winchester | 4:48.23 |