EVENT 301 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 2 | Caleb Crowe | 12 | Io Man | 5:18.19 |
| 2 | 4 | Oscar Gavelle | 13 | Rotherham Mo | 5:10.01 |
| 3 | 6 | Jack Harmer | 14 | Satellite | 5:01.00 |
| 4 | 8 | Joshua Booth | 14 | Rotherham Mo | 4:57.44 |
| 5 | 7 | Reuban Fox-Kirkham | 14 | Ellesmere Co | 4:59.60 |
| 6 | 5 | Finn Proud | 13 | Newcastle | 5:03.11 |
| 7 | 3 | James Vaughan | 12 | Wigan BEST | 5:17.25 |
| 8 | 1 | Thomas Rickels | 11 | Warrington W | 5:19.30 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Simon Harrison | 14 | Satellite | 4:53.50 |
| 2 | 12 | Jack Pritchard | 15 | Wigan BEST | 4:51.50 |
| 3 | 14 | Alexander Hornby | 15 | Wigan BEST | 4:49.80 |
| 4 | 16 | Henry Taylor | 14 | Stockport Mo | 4:47.10 |
| 5 | 15 | Samuel O'Reilly-Smith | 15 | Newcastle St | 4:48.80 |
| 6 | 13 | Alex Rix | 15 | Warrington W | 4:50.70 |
| 7 | 11 | Felix Benson | 15 | Stockport Mo | 4:51.90 |
| 8 | 9 | Jai Diddee | 14 | Tynemouth | 4:54.80 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Archie Dandy | 14 | Ellesmere Co | 4:44.40 |
| 2 | 20 | Thomas Newton | 16 | Newcastle | 4:42.40 |
| 3 | 22 | Alastair Jeffrey | 17 | Satellite | 4:37.80 |
| 4 | 24 | Harvey Reed | 15 | Chase | 4:34.00 |
| 5 | 23 | Philip Suddes | 16 | York City | 4:37.18 |
| 6 | 21 | William Line | 15 | Winsford | 4:39.10 |
| 7 | 19 | Seth Hinitt | 16 | Bassetlaw SS | 4:43.70 |
| 8 | 17 | Oliver Ecob | 15 | Stockport Mo | 4:45.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 26 | Lachlan Beazley | 15 | Altrincham | 4:33.40 |
| 2 | 28 | Zachariah Dale | 15 | Newcastle St | 4:31.60 |
| 3 | 30 | Jake Christon | 16 | Co Manch Aq | 4:29.60 |
| 4 | 32 | Jack Finnie | 15 | Rotherham Mo | 4:28.25 |
| 5 | 31 | Daniel Jones | 16 | Wigan BEST | 4:28.94 |
| 6 | 29 | David Pugh | 20 | Stockport Mo | 4:30.20 |
| 7 | 27 | George Turner | 15 | Tynemouth | 4:31.70 |
| 8 | 25 | Cameron Rhodes | 17 | Rotherham Mo | 4:33.56 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 34 | Joshua Keogh | 14 | Bolton Metro | 4:25.20 |
| 2 | 36 | Finlay Pope | 15 | Stockport Mo | 4:23.40 |
| 3 | 38 | Lewis Cottam | 17 | Stockport Mo | 4:21.20 |
| 4 | 40 | William Timmins | 18 | Wrekin Coll | 4:18.60 |
| 5 | 39 | Archie Neaves | 17 | Ellesmere Co | 4:20.40 |
| 6 | 37 | Cillian McGuinness | 17 | Bassetlaw SS | 4:22.60 |
| 7 | 35 | Matthew Haynes | 17 | Wigan BEST | 4:24.82 |
| 8 | 33 | Freddie Brook | 16 | York City | 4:28.20 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 42 | Oliver Caddick | 17 | Chase | 4:17.20 |
| 2 | 44 | Ryan Coulthard | 19 | Co Manch Aq | 4:16.60 |
| 3 | 46 | Luke Critchlow | 17 | Stockport Mo | 4:13.50 |
| 4 | 48 | Louis Fenson | 20 | Loughboro Un | 4:08.60 |
| 5 | 47 | Luke Booth | 17 | Rotherham Mo | 4:11.50 |
| 6 | 45 | Jacob Atkinson | 18 | Stockport Mo | 4:13.69 |
| 7 | 43 | Tom McCabe | 17 | Stockport Mo | 4:17.10 |
| 8 | 41 | Evagelos Xynarianos | 19 | Stockport Mo | 4:18.50 |