EVENT 509 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 3 | 2 | Joshua Weston | 14 | Wycombe Dist | 4:29.89 |
| 4 | 4 | Ben Wright | 14 | Donc Dartes | 4:29.24 |
| 5 | 3 | Adam Strickland | 14 | Gates &Whick | 4:29.51 |
| 6 | 1 | Jan Poulton | 14 | Wycombe Dist | 4:29.94 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 6 | Liam Dawson | 13 | Nova Cent'n | 4:29.11 |
| 1 | 8 | Thomas Deffains | 14 | TigersJersey | 4:28.77 |
| 2 | 10 | Nathan Bunkle | 14 | Harrogate | 4:28.50 |
| 3 | 12 | R Rowbotham-Keating | 13 | Co Manch Aq | 4:28.30 |
| 4 | 14 | Oliver Taylor | 14 | Co Manch Aq | 4:27.86 |
| 5 | 13 | William Baines | 13 | Bo Stockton | 4:27.88 |
| 6 | 11 | Daniel Kennedy | 14 | Co Leicester | 4:28.37 |
| 7 | 9 | Brandon Cartwright | 14 | Bo Kirklees | 4:28.72 |
| 8 | 7 | Niall Connell | 14 | Co Coventry | 4:29.11 |
| 9 | 5 | Lewis Cottam | 13 | Stockport Mo | 4:29.21 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 16 | Adam Barrett | 14 | Gates &Whick | 4:27.15 |
| 1 | 18 | Ryan Zhao | 14 | Gates &Whick | 4:27.04 |
| 2 | 20 | Kieran Bott | 15 | Co Leicester | 4:22.57 |
| 3 | 22 | Thomas Trebilcock | 15 | Truro City | 4:21.65 |
| 4 | 24 | Ben Penhale | 15 | TauntonDeane | 4:21.07 |
| 5 | 23 | James Bartley | 15 | Mt Kelly | 4:21.64 |
| 6 | 21 | Ben Newell | 15 | Didcot & Bar | 4:21.98 |
| 7 | 19 | Jack Gartside | 15 | Northampton | 4:22.76 |
| 8 | 17 | Jack Haynes | 14 | Wolv'hampton | 4:27.09 |
| 9 | 15 | Evan Jones | 14 | Millfield | 4:27.27 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 26 | Andrew Hall | 15 | Nova Cent'n | 4:20.64 |
| 1 | 28 | Batuhan Paker | 16 | Plymouth Lea | 4:20.22 |
| 2 | 30 | James Speers | 15 | Basildon Ph | 4:20.12 |
| 3 | 32 | Billy Wotton | 15 | Co Oxford | 4:19.97 |
| 4 | 34 | Ellis Stanhope | 16 | Sevenoaks | 4:19.28 |
| 5 | 33 | Alireza Maleki | 16 | Plymouth Lea | 4:19.63 |
| 6 | 31 | Benjamin Foster | 16 | Stockport Mo | 4:20.01 |
| 7 | 29 | Jolan Bennett | 15 | Stockport Mo | 4:20.21 |
| 8 | 27 | Oscar North | 15 | Plymouth Lea | 4:20.24 |
| 9 | 25 | Edward Hunt | 15 | Teddington | 4:21.04 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 36 | Joseph Day | 17 | Exeter City | 4:19.14 |
| 1 | 38 | Shay Bradley | 17 | Co Derby | 4:19.08 |
| 2 | 40 | Jack Price | 16 | Chesterfield | 4:19.02 |
| 3 | 42 | Isaac Von Fintel | 17 | Co Derby | 4:18.79 |
| 4 | 44 | Kenji McDade | 16 | Co Oxford | 4:18.60 |
| 5 | 43 | George Barnes | 17 | Ealing | 4:18.79 |
| 6 | 41 | James Goodwin | 16 | Co Birm'ham | 4:18.99 |
| 7 | 39 | Thomas Wyatt | 16 | Derventio | 4:19.03 |
| 8 | 37 | Lewis Maxwell | 15 | Derwentside | 4:19.11 |
| 9 | 35 | Jude Liddiard | 17 | Co St Albans | 4:19.24 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 46 | Ethan Rayment | 17 | Plymouth Lea | 4:18.47 |
| 1 | 48 | Oliver Duckworth | 16 | Grimsby AST | 4:17.76 |
| 2 | 50 | Thomas Davidson | 16 | Wolv'hampton | 4:17.31 |
| 3 | 52 | Thomas Menlove | 17 | Winchester | 4:17.04 |
| 4 | 54 | Jamie Owen | 16 | Amersham | 4:16.36 |
| 5 | 53 | Ryan Wilcox | 16 | Nova Cent'n | 4:16.88 |
| 6 | 51 | James Chennells | 17 | Berkhamsted | 4:17.25 |
| 7 | 49 | Ross Philp | 16 | Staines | 4:17.50 |
| 8 | 47 | Marcus Cook | 17 | Crewe Flyers | 4:18.41 |
| 9 | 45 | Callum Rushan | 16 | Leek | 4:18.49 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 56 | Willem Koster | 16 | Dulwich Dolp | 4:15.89 |
| 1 | 58 | Herbie Kinder | 16 | Co Peterboro | 4:15.54 |
| 2 | 60 | Brandon Sayers | 20 | Brompton | 4:14.78 |
| 3 | 62 | Kane Murcott | 18 | Royal Wolv | 4:13.92 |
| 4 | 64 | Adam Law | 17 | Bo Kirklees | 4:13.52 |
| 5 | 63 | Arran Bostock | 19 | Pioneer 79 | 4:13.59 |
| 6 | 61 | Joshua Harris | 17 | Nova Cent'n | 4:14.21 |
| 7 | 59 | Piers Bowden | 17 | Wycombe Dist | 4:15.26 |
| 8 | 57 | Ryan Huddart | 17 | Derventio | 4:15.82 |
| 9 | 55 | Alexander Sargeant | 16 | Millfield | 4:16.12 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 67 | Jay Snowden | 18 | Plymouth Lea | 4:13.15 |
| 1 | 71 | Jack Buswell | 17 | Northampton | 4:12.00 |
| 2 | 75 | Charlie Hopkins | 19 | Swansea Aq | 4:11.73 |
| 3 | 79 | Ben Cope | 17 | Royal Wolv | 4:10.42 |
| 4 | 83 | Marcus Svendsen | 21 | Denmark | 3:58.40 |
| 5 | 81 | Marcus Johnson | 19 | Co Milton K | 4:07.58 |
| 6 | 77 | Myles Turner | 18 | West Suffolk | 4:11.07 |
| 7 | 73 | Samuel Blackett | 20 | Northampton | 4:11.85 |
| 8 | 69 | Alex Crossland-Robins | 18 | Stockport Mo | 4:12.47 |
| 9 | 65 | Samuel Williams | 18 | Nova Cent'n | 4:13.50 |
| Heat Number - 9 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 68 | Jacob Butterfield | 18 | Co Leeds | 4:13.04 |
| 1 | 72 | Bailey Hairsine | 19 | Co Manch Aq | 4:11.89 |
| 2 | 76 | Samuel Neeld | 18 | Wrekin Coll | 4:11.09 |
| 3 | 80 | Daniel Jenkins | 17 | Co Oxford | 4:10.36 |
| 4 | 84 | Mikkel Gadgaard | 19 | Denmark | 3:57.39 |
| 5 | 82 | Nicolas Blanch | 21 | Denmark | 3:59.65 |
| 6 | 78 | Ralph Muncer | 17 | Co St Albans | 4:11.02 |
| 7 | 74 | Adam Hall | 17 | Tewkesbury | 4:11.75 |
| 8 | 70 | Jared Armstrong | 18 | Co Manch Aq | 4:12.18 |
| 9 | 66 | Luke Sugden | 19 | Hatfield | 4:13.18 |