EVENT 104 Mens Open 400m IM - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 2 | Jack Plummer | 13 | Mt Kelly | 5:20.45 |
| 2 | 4 | Ryan Wilcox | 13 | Nova Cent'n | 5:19.85 |
| 3 | 6 | Liam Brennan | 13 | Romford Town | 5:18.80 |
| 4 | 8 | Luke Pullen | 13 | Havant & Wat | 5:18.20 |
| 5 | 7 | Kieran Dale | 13 | Thanet Swim | 5:18.65 |
| 6 | 5 | Daniel Butler | 13 | Chester Le S | 5:19.12 |
| 7 | 3 | Joseph Kingsland | 12 | Nova Cent'n | 5:20.30 |
| 8 | 1 | Jordon McPhail | 12 | Guildford Ct | 5:20.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 10 | Aaron Carroll | 13 | Munster IRL | 5:16.06 |
| 1 | 12 | Timothy Leberl | 13 | Beckenham | 5:13.15 |
| 2 | 14 | James Cooper | 13 | Romford Town | 5:11.84 |
| 3 | 16 | James Bilbao | 14 | Co Hereford | 5:10.22 |
| 4 | 18 | Ben Smith | 14 | Co Liverpool | 5:09.30 |
| 5 | 17 | Huw Williams | 13 | Millfield | 5:10.13 |
| 6 | 15 | Eoin Corby | 13 | Munster IRL | 5:11.43 |
| 7 | 13 | James Newman | 13 | Co Leicester | 5:12.12 |
| 8 | 11 | Edward Mildred | 12 | Northampton | 5:14.13 |
| 9 | 9 | Luke Skelding | 13 | Co Birm'ham | 5:17.10 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 20 | Oliver Watson | 13 | Co Birm'ham | 5:08.98 |
| 1 | 22 | Daniel Petrov | 14 | Chelsea&West | 5:07.28 |
| 2 | 24 | Timur Gulyiyen | 14 | Wycombe Dist | 5:06.47 |
| 3 | 26 | Cole James | 14 | Hatfield | 5:05.73 |
| 4 | 28 | James Pettener | 14 | Co Liverpool | 5:05.33 |
| 5 | 27 | Joe Basdeo-Taylor | 13 | KingstonHull | 5:05.34 |
| 6 | 25 | William Woodward | 14 | Halton | 5:06.43 |
| 7 | 23 | Christian Tai | 14 | Bourmth Coll | 5:06.72 |
| 8 | 21 | Joshua Cowham | 13 | Thanet Swim | 5:08.72 |
| 9 | 19 | Cole Lee | 13 | Co Leicester | 5:09.19 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 30 | Harvey Jones | 14 | Stockport Mo | 5:04.86 |
| 1 | 32 | Brett Davies | 14 | Northampton | 5:03.94 |
| 2 | 34 | William Hawkes | 14 | Grantham | 5:02.50 |
| 3 | 36 | Joshua Harris | 14 | Nova Cent'n | 5:01.83 |
| 4 | 38 | Joel Lange | 14 | Maidenhead | 5:01.20 |
| 5 | 37 | Adam Blackshaw | 15 | Winsford | 5:01.41 |
| 6 | 35 | Samuel Loizou | 14 | Bo Kirklees | 5:02.39 |
| 7 | 33 | Billy Harrison | 14 | Romford Town | 5:03.62 |
| 8 | 31 | Alfie Kelly | 14 | Tynemouth | 5:04.79 |
| 9 | 29 | Finnian Trehane | 13 | Bourmth Coll | 5:04.94 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 40 | Harry Nicholls | 15 | Basildon Ph | 5:00.28 |
| 1 | 42 | Ben Hooper | 15 | Bo Of Harrow | 4:59.72 |
| 2 | 44 | Jack To | 15 | Co Sheffield | 4:59.55 |
| 3 | 46 | Henry Dixon | 15 | Aquae Sulis | 4:59.42 |
| 4 | 48 | Myles Turner | 15 | West Suffolk | 4:59.40 |
| 5 | 47 | Thomas Christie-Smith | 15 | Co Leicester | 4:59.42 |
| 6 | 45 | Dominic Johnson | 15 | Portsmouth N | 4:59.48 |
| 7 | 43 | Samuel Peck | 15 | UEA Norwich | 4:59.56 |
| 8 | 41 | Nathan Wood | 15 | Cleethorpes | 5:00.18 |
| 9 | 39 | Alex Crossland-Robins | 15 | Stockport Mo | 5:01.11 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 50 | Paolo Moniz | 15 | Southport | 4:59.23 |
| 1 | 52 | Gregory Butler | 15 | Co Derby | 4:58.73 |
| 2 | 54 | Ryan Andrews | 15 | Co Birm'ham | 4:58.23 |
| 3 | 56 | Ole Mills | 16 | Braintree | 4:52.54 |
| 4 | 58 | William Carter | 17 | Gloucester | 4:52.36 |
| 5 | 57 | Bryce Puszet | 16 | Ealing | 4:52.49 |
| 6 | 55 | Connor Joyce | 15 | Cockermouth | 4:56.82 |
| 7 | 53 | Rhys Taylor | 15 | Nova Cent'n | 4:58.50 |
| 8 | 51 | Elliot Pickford | 15 | Wirral Metro | 4:59.06 |
| 9 | 49 | Dylan Conway | 15 | Kingston Roy | 4:59.30 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 60 | Conor Bennett | 17 | SwimTrafford | 4:51.89 |
| 1 | 62 | Jack Pickering | 17 | teamipswich | 4:50.54 |
| 2 | 64 | Robert Griffiths | 18 | Rushmoor Ryl | 4:49.93 |
| 3 | 66 | Albert Karavis | 18 | Windsor | 4:49.05 |
| 4 | 68 | Adam Elkington | 17 | Northampton | 4:48.58 |
| 5 | 67 | William McIntyre | 18 | Louth | 4:48.75 |
| 6 | 65 | James Millar | 17 | Portsmouth N | 4:49.17 |
| 7 | 63 | Cadan McCarthy | 15 | Munster IRL | 4:50.10 |
| 8 | 61 | Fraser Scott | 17 | Basildon Ph | 4:51.42 |
| 9 | 59 | Tom Mitchell | 17 | South Lincs | 4:52.26 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 71 | Joseph Stanger | 22 | Boldmere | 4:47.87 |
| 1 | 75 | Ryan Reader | 17 | Co Derby | 4:46.78 |
| 2 | 79 | Samuel Goldrick | 17 | Stockport Mo | 4:44.88 |
| 3 | 83 | Simon McCormick | 20 | Derwentside | 4:43.78 |
| 4 | 87 | James Reidy | 18 | Bo Kirklees | 4:41.17 |
| 5 | 85 | Jack Baister | 18 | Middlesboro | 4:42.09 |
| 6 | 81 | Thomas Sarah | 21 | Co Cambridge | 4:43.96 |
| 7 | 77 | William Slawson | 18 | Wrekin Coll | 4:45.14 |
| 8 | 73 | Lewis Robertson | 18 | Billingham | 4:47.05 |
| 9 | 69 | James Row | 18 | Newcastle | 4:48.23 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 72 | Edward Baxter | 17 | Cockermouth | 4:47.44 |
| 1 | 76 | Thomas Millburn | 17 | Cockermouth | 4:45.19 |
| 2 | 80 | Thomas Nelson | 19 | Wirral Metro | 4:44.09 |
| 3 | 84 | Oliver Jermy | 18 | Portsmouth N | 4:42.97 |
| 4 | 88 | Hayden Griffiths | 18 | Ellesmere Co | 4:41.14 |
| 5 | 86 | Nathan Wells | 17 | West Norfolk | 4:41.61 |
| 6 | 82 | Matthew Evans | 18 | Chase | 4:43.91 |
| 7 | 78 | Jordan Honour | 17 | Thanet Swim | 4:45.01 |
| 8 | 74 | Andrew Blackett | 17 | Gates &Whick | 4:46.79 |
| 9 | 70 | Isaac Peace | 17 | Co Leicester | 4:48.20 |