EVENT 411 Mens Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 1 | Dalton Clapham | 03 | Co Leeds | 4:30.36 |
| 1 | 3 | Ethan Sutcliffe | 03 | Co Leeds | 4:29.70 |
| 2 | 5 | Jayden Wordley | 03 | Team Bath AS | 4:29.48 |
| 3 | 7 | Ben Penhale | 03 | Clevedon | 4:29.10 |
| 4 | 9 | James Bartley | 03 | Co Leicester | 4:29.04 |
| 5 | 8 | Jolan Bennett | 03 | Stockport Mo | 4:29.06 |
| 6 | 6 | Lewis Maxwell | 03 | Derwentside | 4:29.16 |
| 7 | 4 | Jonah Silk | 03 | Co Bristol | 4:29.58 |
| 8 | 2 | Joshua Skinner | 03 | Nova Cent'n | 4:30.20 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 11 | James Hart | 04 | Reading | 4:28.33 |
| 1 | 13 | Jacob Whittle | 04 | Derventio | 4:27.67 |
| 2 | 15 | Owen Webster | 03 | St Felix Sch | 4:27.57 |
| 3 | 17 | Joshua Press | 03 | Co Milton K | 4:26.88 |
| 4 | 19 | Ellis Stanhope | 02 | Sevenoaks | 4:24.35 |
| 5 | 18 | Willem Koster | 02 | Dulwich Dolp | 4:24.44 |
| 6 | 16 | Jimi Knowles | 03 | Nova Cent'n | 4:26.90 |
| 7 | 14 | Samuel Rose | 03 | West Norfolk | 4:27.63 |
| 8 | 12 | Oliver Bedworth | 03 | Guildford Ct | 4:28.22 |
| 9 | 10 | Elijah Kendrick | 04 | Shiverers | 4:28.90 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 21 | Thomas Wyatt | 02 | Derventio | 4:24.25 |
| 1 | 23 | Joel Donald | 02 | Stockport Mo | 4:24.18 |
| 2 | 25 | Oliver Duckworth | 02 | Grimsby AST | 4:23.92 |
| 3 | 27 | Benjamin Winterburn | 01 | Carnforth | 4:23.53 |
| 4 | 29 | Luke Jackson | 02 | Cockermouth | 4:23.38 |
| 5 | 28 | Ryan Huddart | 01 | Rykneld | 4:23.49 |
| 6 | 26 | Cole James | 01 | Hatfield | 4:23.61 |
| 7 | 24 | Matthew Smith | 02 | Northampton | 4:23.98 |
| 8 | 22 | Cameron Polak | 02 | TigersJersey | 4:24.19 |
| 9 | 20 | Jack Price | 02 | Chesterfield | 4:24.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 31 | Jude Liddiard | 01 | Co St Albans | 4:23.14 |
| 1 | 33 | Joshua Bristow | 02 | Modernian | 4:22.61 |
| 2 | 35 | Adam Law | 01 | Bo Kirklees | 4:22.21 |
| 3 | 37 | Ben Turland | 01 | Pioneer 79 | 4:21.55 |
| 4 | 39 | William Graham | 01 | Melton M'bry | 4:21.23 |
| 5 | 38 | Hymie Connell | 01 | Co Coventry | 4:21.48 |
| 6 | 36 | Kyo Tanner | 02 | Ellesmere Co | 4:21.71 |
| 7 | 34 | William Earl | 02 | Co Sheffield | 4:22.37 |
| 8 | 32 | Aaron Beckford | 02 | Derwentside | 4:22.87 |
| 9 | 30 | Ryan Wilcox | 02 | Nova Cent'n | 4:23.20 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 41 | James Cooper | 02 | Basildon Ph | 4:20.99 |
| 1 | 43 | Jack Buswell | 01 | Northampton | 4:20.74 |
| 2 | 45 | Joel Lange | 01 | Maidenhead | 4:20.61 |
| 3 | 47 | Oliver Inness | 01 | Wycombe Dist | 4:18.93 |
| 4 | 49 | Isaac Von Fintel | 01 | Leic Peng | 4:18.71 |
| 5 | 48 | Fergus Phelan | 01 | Winchester | 4:18.91 |
| 6 | 46 | Ralph Muncer | 01 | Co St Albans | 4:19.09 |
| 7 | 44 | Matthew Burton | 01 | Maxwell | 4:20.73 |
| 8 | 42 | George Farr | 01 | Co Bristol | 4:20.86 |
| 9 | 40 | Thomas Watkin | 02 | Royal Wolv | 4:21.21 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 51 | Thomas Menlove | 01 | Winchester | 4:18.29 |
| 1 | 53 | Oliver O'Halleron | 00 | Derwentside | 4:16.48 |
| 2 | 55 | Myles Turner | 00 | West Suffolk | 4:15.68 |
| 3 | 57 | Reece Nicholls | 00 | Basildon Ph | 4:15.28 |
| 4 | 59 | Benjamin Goldfinch | 98 | Wycombe Dist | 4:14.86 |
| 5 | 58 | Samuel Neeld | 00 | Wrekin Coll | 4:15.20 |
| 6 | 56 | Jay Snowden | 00 | Plymouth Lea | 4:15.46 |
| 7 | 54 | Ben Harrison | 00 | Mt Kelly | 4:16.44 |
| 8 | 52 | Harry Whiteman | 00 | Co Peterboro | 4:16.79 |
| 9 | 50 | Adam Hall | 01 | Gloucester | 4:18.45 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 62 | James Morrison | 99 | Bolton Metro | 4:13.66 |
| 1 | 66 | Samuel Blackett | 98 | Northampton | 4:13.02 |
| 2 | 70 | Henry Dixon | 00 | Mt Kelly | 4:12.24 |
| 3 | 74 | Elliot Pickford | 00 | Wirral Metro | 4:10.04 |
| 4 | 78 | William Slawson | 97 | Wrekin Coll | 4:08.34 |
| 5 | 76 | Declan Hall | 99 | Wigan BEST | 4:08.65 |
| 6 | 72 | Bailey Hairsine | 99 | KingstonHull | 4:11.49 |
| 7 | 68 | Benjamin Prosser | 00 | Wycombe Dist | 4:12.48 |
| 8 | 64 | Thomas Smith | 98 | Northampton | 4:13.57 |
| 9 | 60 | Dominic Wooldridge | 95 | Exeter City | 4:14.77 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | YoB | Club/Country | Time |
| 0 | 63 | Kane Murcott | 00 | Royal Wolv | 4:13.59 |
| 1 | 67 | Max Wilson | 00 | Modernian | 4:12.72 |
| 2 | 71 | William Davies | 00 | Swindon Dolp | 4:12.19 |
| 3 | 75 | Matthew Wright | 98 | Bath Univ | 4:09.24 |
| 4 | 79 | Samuel Crabtree | 99 | Thanet Swim | 4:07.47 |
| 5 | 77 | William Martin | 00 | Maxwell | 4:08.58 |
| 6 | 73 | Jack Shillinglaw | 99 | Ellesmere Co | 4:10.37 |
| 7 | 69 | Jordan Byrne | 00 | A Lingus IRL | 4:12.33 |
| 8 | 65 | Marcus Johnson | 99 | Co Milton K | 4:13.35 |
| 9 | 61 | Joseph Dobb | 00 | Bromley | 4:14.34 |