EVENT 101 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 2 | Adam Akram | 14 | Bo Kirklees | 4:27.11 |
| 4 | 4 | Timothy Leberl | 14 | Beckenham | 4:26.64 |
| 5 | 3 | Pierce Greening | 13 | Cockermouth | 4:26.92 |
| 6 | 1 | Keir Buchanan | 14 | SLanarkshire | 4:27.12 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 6 | Pietro Forconi | 13 | Winchester | 4:26.48 |
| 1 | 8 | Luke Pullen | 14 | Havant & Wat | 4:26.24 |
| 2 | 10 | Hayden Ah Wan | 14 | Plymouth Lea | 4:24.93 |
| 3 | 12 | Alexander Hindle | 14 | Co Birm'ham | 4:24.08 |
| 4 | 14 | Ciaran Thomas | 14 | Newcastle | 4:21.61 |
| 5 | 13 | Callum Rushan | 14 | Leek | 4:23.00 |
| 6 | 11 | Dante Des Rosier | 14 | Ellesmere Co | 4:24.92 |
| 7 | 9 | Joel Sinclair | 14 | Carlisle Aq | 4:25.04 |
| 8 | 7 | Daniel Butler | 14 | Chester Le S | 4:26.27 |
| 9 | 5 | Jacob Davies | 14 | Chase | 4:26.56 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 16 | James Cooper | 14 | Basildon Ph | 4:21.43 |
| 1 | 18 | Huw Williams | 14 | Millfield | 4:20.94 |
| 2 | 20 | Liam Birrell | 15 | Co Leeds | 4:19.35 |
| 3 | 22 | Charlie Hutchison | 14 | Ellesmere Co | 4:19.10 |
| 4 | 24 | Oliver Inness | 15 | Bicester | 4:18.91 |
| 5 | 23 | Jamie McCaffray | 15 | Modernian | 4:19.00 |
| 6 | 21 | Myles Robinson-Young | 14 | Co Peterboro | 4:19.11 |
| 7 | 19 | Billy Pettit | 15 | Northampton | 4:19.42 |
| 8 | 17 | Dara Clarke | 14 | Co Lincoln P | 4:21.40 |
| 9 | 15 | Joseph Russell | 14 | Co Cant'bury | 4:21.55 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 26 | Joshua Loney | 15 | Swansea Aq | 4:18.39 |
| 1 | 28 | Reese Housden | 14 | Hatfield | 4:17.09 |
| 2 | 30 | Marcus Dey | 15 | Co Salford | 4:16.29 |
| 3 | 32 | Adam Wilson | 15 | Newcastle | 4:15.98 |
| 4 | 34 | Thomas Jeffers | 16 | Perth City | 4:15.59 |
| 5 | 33 | Harry Constantine | 16 | Hatfield | 4:15.78 |
| 6 | 31 | Joel Thompson | 15 | Shiverers | 4:16.08 |
| 7 | 29 | Daniel Jenkins | 15 | Co Oxford | 4:17.00 |
| 8 | 27 | Daniel Marotta | 15 | Swansea Aq | 4:18.04 |
| 9 | 25 | Adam Metcalf | 15 | Ellesmere Co | 4:18.81 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 36 | Jared Armstrong | 16 | SwimTrafford | 4:15.47 |
| 1 | 38 | Henry Offin | 16 | Guildford Ct | 4:14.91 |
| 2 | 40 | Oscar Brain | 15 | Plymouth Lea | 4:14.61 |
| 3 | 42 | Jacob Butterfield | 16 | Co Leeds | 4:14.16 |
| 4 | 44 | George Barber | 15 | Grimsby AST | 4:13.79 |
| 5 | 43 | Samuel Dyer | 16 | Northampton | 4:14.02 |
| 6 | 41 | Duncan McKinney | 16 | Co Glasgow | 4:14.35 |
| 7 | 39 | Henry Willis | 16 | Newcastle | 4:14.81 |
| 8 | 37 | Archie Plowman | 15 | Northampton | 4:15.24 |
| 9 | 35 | Llewelyn Davies | 15 | Swansea Aq | 4:15.48 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 46 | Ioan Evans | 14 | Bridgend Cty | 4:13.41 |
| 1 | 48 | Hector Pardoe | 15 | Ellesmere Co | 4:13.29 |
| 2 | 50 | Alfie Kelly | 15 | Newcastle | 4:12.69 |
| 3 | 52 | Joseph Page | 16 | Havant & Wat | 4:12.40 |
| 4 | 54 | Scott Provan | 15 | Co Salford | 4:12.29 |
| 5 | 53 | William Martin | 16 | Maxwell | 4:12.33 |
| 6 | 51 | William Foster | 16 | Co Derby | 4:12.67 |
| 7 | 49 | Archie Goodburn | 15 | Warrender Ba | 4:12.88 |
| 8 | 47 | Henry Dixon | 16 | Aquae Sulis | 4:13.29 |
| 9 | 45 | Jack Buswell | 15 | Northampton | 4:13.72 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 56 | Adam Davies | 15 | Plymouth Lea | 4:10.92 |
| 1 | 58 | James Watson | 16 | Swindon Dolp | 4:10.35 |
| 2 | 60 | Jamie Scholes | 16 | Co Peterboro | 4:08.97 |
| 3 | 62 | Harry Lewis-Mitchell | 18 | Stockport Mo | 4:08.26 |
| 4 | 64 | Samuel Osborne | 15 | Co Birm'ham | 4:08.00 |
| 5 | 63 | Daniel Hall | 18 | Co Leeds | 4:08.20 |
| 6 | 61 | William Ryley | 18 | Co Newport | 4:08.33 |
| 7 | 59 | Ryan Retson | 16 | F.I.R.S.T. | 4:10.09 |
| 8 | 57 | Harley Beentjes | 16 | Wigan BEST | 4:10.52 |
| 9 | 55 | Elliot Pickford | 16 | Wirral Metro | 4:11.48 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 66 | Thomas Flower | 17 | RichmondDale | 4:07.77 |
| 1 | 68 | Luke Turley | 16 | Hatfield | 4:07.55 |
| 2 | 70 | Nathan Wells | 17 | Ellesmere Co | 4:06.61 |
| 3 | 72 | Charlie Humphries | 17 | Co Sheffield | 4:06.15 |
| 4 | 74 | Joshua Duggan | 20 | Loughboro Un | 4:05.16 |
| 5 | 73 | Daniel Davies | 18 | Swansea Aq | 4:05.21 |
| 6 | 71 | Jakob Goodman | 16 | Millfield | 4:06.53 |
| 7 | 69 | Thomas Thornley | 17 | Bicester | 4:07.48 |
| 8 | 67 | William Bell | 14 | Co Leicester | 4:07.66 |
| 9 | 65 | Matthew George | 16 | Co Salford | 4:07.89 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 76 | Cameron Croot | 17 | Swansea Aq | 4:04.91 |
| 1 | 78 | Richard Laird | 17 | SLanarkshire | 4:04.68 |
| 2 | 80 | Thomas Kingham | 18 | Millfield | 4:04.27 |
| 3 | 82 | James Gillie | 18 | Millfield | 4:03.73 |
| 4 | 84 | Regan Lloyd | 19 | teamipswich | 4:03.22 |
| 5 | 83 | Thomas Flaherty | 19 | Co Milton K | 4:03.49 |
| 6 | 81 | Ross Hill | 19 | Loughboro Un | 4:03.95 |
| 7 | 79 | Harrison Coulter | 17 | Stockport Mo | 4:04.28 |
| 8 | 77 | Luke Robins | 17 | Millfield | 4:04.75 |
| 9 | 75 | Tony-Joe Trett Oliver | 17 | Mt Kelly | 4:05.11 |
| Heat Number - 10 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 87 | Nathan Wells | 18 | West Norfolk | 4:02.54 |
| 1 | 91 | George Taplin | 17 | Maidenhead | 4:00.49 |
| 2 | 95 | Kyle Chisholm | 19 | Bo Kirklees | 3:58.79 |
| 3 | 99 | Nathan Hughes | 16 | Hatfield | 3:57.45 |
| 4 | 103 | Nicholas Grainger | 22 | Co Sheffield | 3:50.59 |
| 5 | 101 | Tom Derbyshire | 18 | Royal Wolv | 3:54.47 |
| 6 | 97 | Brodie Williams | 17 | Millfield | 3:58.05 |
| 7 | 93 | Kieran Bird | 17 | Bicester | 3:58.95 |
| 8 | 89 | Fraser Minnican | 21 | Loughboro Un | 4:02.34 |
| 9 | 85 | Ben Evans | 19 | Thanet Swim | 4:03.03 |
| Heat Number - 11 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 88 | Chris Lowther | 21 | Co Glasgow | 4:02.52 |
| 1 | 92 | Samuel Budd | 18 | Co Sheffield | 3:59.77 |
| 2 | 96 | Cameron Brown | 20 | Swansea Aq | 3:58.43 |
| 3 | 100 | Thomas Howley | 20 | Newcastle | 3:55.62 |
| 4 | 104 | Jay Lelliott | 21 | Bath Univ | 3:47.68 |
| 5 | 102 | Caleb Hughes | 21 | Loughboro Un | 3:52.08 |
| 6 | 98 | Angus Barr | 18 | SLanarkshire | 3:57.95 |
| 7 | 94 | Thomas Atkinson | 18 | Co Sheffield | 3:58.85 |
| 8 | 90 | Jamie O'Connor | 17 | Thanet Swim | 4:00.92 |
| 9 | 86 | Max Murphy | 16 | Co Milton K | 4:02.62 |