EVENT 101 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 2 | William Martin | 17 | Maxwell | 4:08.58 |
| 4 | 4 | Jacques Bonsell | 18 | Blackpool Aq | 4:08.17 |
| 5 | 3 | Adam Wilson | 16 | Newcastle | 4:08.18 |
| 6 | 1 | Gordon Mason | 18 | Ellesmere Co | 4:08.76 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 6 | Harry Constantine | 17 | Hatfield | 4:08.11 |
| 2 | 8 | Myles Robinson-Young | 15 | Co Peterboro | 4:07.65 |
| 3 | 10 | Richard Laird | 18 | Eastkilbride | 4:07.00 |
| 4 | 12 | Tony-Joe Trett Oliver | 18 | Mt Kelly | 4:06.42 |
| 5 | 11 | Nathan Wells | 18 | Ellesmere Co | 4:06.61 |
| 6 | 9 | Max Tambling | 18 | Hackney | 4:07.61 |
| 7 | 7 | Adam Davies | 16 | Plymouth Lea | 4:07.94 |
| 8 | 5 | Archie Plowman | 16 | Northampton | 4:08.15 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 14 | Jamie Scholes | 17 | Co Peterboro | 4:06.04 |
| 2 | 16 | Ioan Evans | 15 | Co Cardiff | 4:05.50 |
| 3 | 18 | Samuel Crabtree | 18 | Thanet Swim | 4:04.59 |
| 4 | 20 | Archie Goodburn | 16 | Warrender Ba | 4:04.34 |
| 5 | 19 | Joel Thompson | 16 | Shiverers | 4:04.56 |
| 6 | 17 | William Bell | 15 | Co Leicester | 4:04.74 |
| 7 | 15 | Harley Beentjes | 17 | Wigan BEST | 4:05.64 |
| 8 | 13 | Ryan Retson | 17 | F.I.R.S.T. | 4:06.05 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 22 | Charlie Humphries | 18 | Co Sheffield | 4:03.89 |
| 2 | 24 | Kieran Bird | 18 | Millfield | 4:02.75 |
| 3 | 26 | William Foster | 17 | Co Derby | 4:02.72 |
| 4 | 28 | Thomas Thornley | 18 | Millfield | 4:02.38 |
| 5 | 27 | Matthew George | 17 | Co Salford | 4:02.55 |
| 6 | 25 | Samuel Osborne | 16 | Co Birm'ham | 4:02.73 |
| 7 | 23 | Casey Barrett | 18 | Royal Wolv | 4:03.21 |
| 8 | 21 | Luke Robins | 18 | Millfield | 4:03.96 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 30 | Nathan Wells | 19 | Loughboro Un | 4:00.30 |
| 2 | 32 | Max Murphy | 17 | Co Milton K | 3:58.00 |
| 3 | 34 | Michael Gunning | 23 | London Aquat | 3:57.77 |
| 4 | 36 | Tobias Robinson | 21 | Loughboro Un | 3:57.35 |
| 5 | 35 | Cameron Kurle | 20 | Bath Univ | 3:57.51 |
| 6 | 33 | Jakob Goodman | 17 | Millfield | 3:57.98 |
| 7 | 31 | Thomas Kingham | 19 | Millfield | 4:00.14 |
| 8 | 29 | Harrison Coulter | 18 | Stockport Mo | 4:00.36 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 39 | Nathan Hughes | 17 | Loughboro Un | 3:55.12 |
| 2 | 43 | Brodie Williams | 18 | Millfield | 3:54.62 |
| 3 | 47 | Timothy Shuttleworth | 20 | Loughboro Un | 3:50.21 |
| 4 | 51 | Stephen Milne | 23 | Perth City | 3:46.00 |
| 5 | 49 | Max Litchfield | 22 | Co Sheffield | 3:50.13 |
| 6 | 45 | Caleb Hughes | 22 | Loughboro Un | 3:52.99 |
| 7 | 41 | Thomas Howley | 21 | Newcastle | 3:55.02 |
| 8 | 37 | Kyle Chisholm | 20 | Bo Kirklees | 3:56.11 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 1 | 40 | Samuel Budd | 19 | Co Sheffield | 3:55.10 |
| 2 | 44 | Daniel Jervis | 21 | Swansea Aq | 3:53.46 |
| 3 | 48 | Jay Lelliott | 22 | Bath Univ | 3:50.14 |
| 4 | 52 | James Guy | 22 | Bath Univ | 3:44.68 |
| 5 | 50 | Nicholas Grainger | 23 | Co Sheffield | 3:47.83 |
| 6 | 46 | Richard Nagy | 24 | Co Sheffield | 3:51.31 |
| 7 | 42 | Tom Derbyshire | 19 | Bath Univ | 3:55.01 |
| 8 | 38 | Luke Turley | 17 | Hatfield | 3:55.78 |