EVENT 109 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 1 | Kaiden Welsby | 13 | Stockport Mo | 4:12.59 |
| 4 | 3 | Robert Darbyshire | 15 | Wyre Forest | 4:12.45 |
| 5 | 2 | Dalton Clapham | 15 | Co Leeds | 4:12.50 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 5 | Joshua Weston | 14 | Wycombe Dist | 4:11.90 |
| 1 | 7 | Oscar North | 15 | Plymouth Lea | 4:11.58 |
| 2 | 9 | James Bartley | 15 | Mt Kelly | 4:11.30 |
| 3 | 11 | Maxwell George | 15 | Mt Kelly | 4:11.05 |
| 4 | 13 | Thomas Sansome | 15 | Wycombe Dist | 4:10.92 |
| 5 | 12 | James Speers | 15 | Basildon Ph | 4:10.95 |
| 6 | 10 | Owen Webster | 15 | St Felix Sch | 4:11.24 |
| 7 | 8 | Yann Divet | 15 | Camden Swiss | 4:11.32 |
| 8 | 6 | Joey Tippin | 15 | Co Leicester | 4:11.73 |
| 9 | 4 | Joshua Skinner | 15 | Nova Cent'n | 4:11.93 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 15 | Pietro Forconi | 15 | Portsmouth N | 4:10.48 |
| 1 | 17 | Aarian Lally | 15 | Hamilton UAE | 4:10.19 |
| 2 | 19 | Jack Gartside | 15 | Northampton | 4:09.84 |
| 3 | 21 | Thomas Trebilcock | 15 | Truro City | 4:09.76 |
| 4 | 23 | Joseph Kingsland | 15 | Nova Cent'n | 4:08.54 |
| 5 | 22 | Michael Klimaszewski | 14 | Hatfield | 4:09.15 |
| 6 | 20 | Andrew Hall | 15 | Nova Cent'n | 4:09.83 |
| 7 | 18 | Samuel Rose | 15 | West Norfolk | 4:10.08 |
| 8 | 16 | Samuel Tucker | 14 | Wycombe Dist | 4:10.32 |
| 9 | 14 | Clement Kubica | 15 | Millfield | 4:10.54 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 25 | Daniel Donovan | 15 | Guildford Ct | 4:07.96 |
| 1 | 27 | Archie Price | 15 | Barnet Copt | 4:07.44 |
| 2 | 29 | Dylan Gallagher | 15 | TauntonDeane | 4:07.37 |
| 3 | 31 | Daniel Gencas | 15 | Romford Town | 4:05.53 |
| 4 | 33 | Jacob Whittle | 14 | Derventio | 4:04.12 |
| 5 | 32 | Lewis Binning | 15 | Basildon Ph | 4:04.52 |
| 6 | 30 | Ethan Sutcliffe | 15 | Co Leeds | 4:06.56 |
| 7 | 28 | Ben Newell | 15 | Didcot & Bar | 4:07.41 |
| 8 | 26 | Tyriese Smith | 14 | Co Liverpool | 4:07.75 |
| 9 | 24 | Jevon Penny | 15 | Northampton | 4:08.21 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 35 | Charley Langford | 15 | Thanet Swim | 4:01.80 |
| 1 | 37 | Adam Hall | 17 | Tewkesbury | 3:59.30 |
| 2 | 39 | Thomas Beamer | 16 | Co Leicester | 3:58.75 |
| 3 | 41 | Max Murphy | 18 | Loughboro Un | 3:58.59 |
| 4 | 43 | Jacques Bonsell | 19 | Co Cambridge | 3:58.36 |
| 5 | 42 | Myles Robinson-Young | 16 | Co Peterboro | 3:58.56 |
| 6 | 40 | Edward Mildred | 15 | Northampton | 3:58.73 |
| 7 | 38 | Matthew Wright | 20 | Bath Univ | 3:58.90 |
| 8 | 36 | Joseph Sadler | 15 | Nova Cent'n | 4:01.10 |
| 9 | 34 | Joseph Deighan | 15 | Stockport Mo | 4:03.89 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 45 | Declan Hall | 19 | Wigan BEST | 3:58.13 |
| 1 | 47 | Jordan Cooley | 19 | Stockport Mo | 3:57.87 |
| 2 | 49 | William Slawson | 21 | Wrekin Coll | 3:57.61 |
| 3 | 51 | Joshua Williams | 16 | Wycombe Dist | 3:57.18 |
| 4 | 53 | Kyle Chisholm | 21 | Stockport Mo | 3:56.44 |
| 5 | 52 | Ryan Reader | 20 | Derventio | 3:56.60 |
| 6 | 50 | Jacob Davies | 16 | Co Birm'ham | 3:57.60 |
| 7 | 48 | Max Tambling | 19 | Hackney | 3:57.76 |
| 8 | 46 | Adam Davies | 17 | Plymouth Lea | 3:57.87 |
| 9 | 44 | Shay Bradley | 17 | Co Derby | 3:58.29 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 56 | Ioan Evans | 16 | Millfield | 3:55.30 |
| 1 | 60 | Charlie Poole | 17 | Co Leicester | 3:53.78 |
| 2 | 64 | Luke Turley | 18 | Bath Univ | 3:50.18 |
| 3 | 68 | Tom Derbyshire | 20 | Bath Univ | 3:47.83 |
| 4 | 72 | Jay Lelliott | 23 | Co Sheffield | 3:43.44 |
| 5 | 70 | Jack McMillan | 18 | Bangor IRL | 3:47.09 |
| 6 | 66 | Tobias Robinson | 22 | Loughboro Un | 3:49.54 |
| 7 | 62 | Regan Lloyd | 21 | teamipswich | 3:52.65 |
| 8 | 58 | Nathan Wells | 20 | Loughboro Un | 3:55.07 |
| 9 | 54 | Alexander Hindle | 16 | Co Birm'ham | 3:55.72 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 57 | Craig Munden | 21 | Loughboro Un | 3:55.07 |
| 1 | 61 | Kieran Bird | 19 | Bath Univ | 3:53.35 |
| 2 | 65 | Samuel Budd | 20 | Co Sheffield | 3:50.13 |
| 3 | 69 | Cameron Kurle | 21 | Bath Univ | 3:47.47 |
| 4 | 73 | Jordan Sloan | 25 | Bangor IRL | 3:43.21 |
| 5 | 71 | Max Litchfield | 23 | Dearne Vall | 3:46.16 |
| 6 | 67 | Brodie Williams | 19 | Millfield | 3:48.29 |
| 7 | 63 | Nathan Hughes | 18 | Hatfield | 3:51.85 |
| 8 | 59 | William Ryley | 20 | Bath Univ | 3:53.87 |
| 9 | 55 | Davide Arioli | 16 | Millfield | 3:55.31 |