EVENT 221 Men 13/16 Yrs 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 3 | 1 | Elliot Lawton | 08 | Co Coventry | 4:30.63 |
| 4 | 3 | Eamonn Djeridi | 08 | Royal Wolv | 4:30.21 |
| 5 | 2 | Jacob Light | 08 | N & D PP SC | 4:30.51 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 4 | Aidan Turner | 09 | N & D PP SC | 4:29.68 |
| 1 | 6 | Harry Pearse | 08 | Mt Kelly | 4:29.22 |
| 2 | 8 | Ben Uff | 08 | Mt Kelly | 4:28.85 |
| 3 | 10 | George Daintith | 08 | Warrington W | 4:27.25 |
| 4 | 12 | Gabriel Shepherd | 08 | Harrogate | 4:27.01 |
| 5 | 11 | Alex Harrop | 08 | teamipswich | 4:27.13 |
| 6 | 9 | Orlando Dearing | 08 | Co Peterboro | 4:28.26 |
| 7 | 7 | Daniel Belsey | 08 | Hatfield | 4:28.90 |
| 8 | 5 | Hugo Young | 08 | S Bournem'th | 4:29.40 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 14 | William Hicklin | 09 | Co Leeds | 4:25.47 |
| 1 | 16 | Joseph Parsons | 07 | Co Cardiff | 4:24.17 |
| 2 | 18 | Ryan Wall | 07 | Co Cambridge | 4:23.57 |
| 3 | 20 | Jack Bamborough | 08 | Co Cardiff | 4:22.55 |
| 4 | 22 | Max El-Mokadem | 08 | RTW Monson | 4:22.26 |
| 5 | 21 | Daniel Walker | 07 | Nova Cent'n | 4:22.31 |
| 6 | 19 | James Burnett | 07 | Warrender Ba | 4:23.23 |
| 7 | 17 | Jacob Barnett | 07 | N & D PP SC | 4:23.99 |
| 8 | 15 | Harry Chandler | 08 | Royal Wolv | 4:25.35 |
| 9 | 13 | Thomas Swales | 09 | Nova Cent'n | 4:26.42 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 24 | Samuel Williams | 07 | Wycombe Dist | 4:22.04 |
| 1 | 26 | Lucas Ellis-Sixsmith | 07 | Nofio Clwyd | 4:21.60 |
| 2 | 28 | Dante Sinnott | 07 | Barnet Copt | 4:20.31 |
| 3 | 30 | Samuel Sterry | 07 | TigersJersey | 4:20.04 |
| 4 | 32 | Joshua Keogh | 08 | Bolton Metro | 4:19.89 |
| 5 | 31 | Ethan Kelly | 08 | Co Liverpool | 4:19.91 |
| 6 | 29 | Billy Bainbridge | 06 | Teddington | 4:20.23 |
| 7 | 27 | Daniel Harris | 07 | Co Leicester | 4:20.38 |
| 8 | 25 | Ethan Potter | 08 | Co Sheffield | 4:21.67 |
| 9 | 23 | Findlay Cordle | 07 | Repton | 4:22.04 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 34 | Finlay Pope | 07 | Stockport Mo | 4:19.73 |
| 1 | 36 | Aran Bissett | 08 | RTW Monson | 4:19.26 |
| 2 | 38 | Luke Stevens | 06 | Leic Sharks | 4:19.19 |
| 3 | 40 | Fergus Thomson | 07 | Mt Kelly | 4:18.58 |
| 4 | 42 | Hayden Annan | 07 | RTW Monson | 4:18.17 |
| 5 | 41 | Ronnie Weall | 07 | Warrington W | 4:18.49 |
| 6 | 39 | Daniel McGuinness | 06 | Basildon Ph | 4:18.95 |
| 7 | 37 | Jacob Mills | 07 | Leic Sharks | 4:19.25 |
| 8 | 35 | Raheel Mahmood | 07 | Romford Town | 4:19.29 |
| 9 | 33 | Isaac Thompson | 08 | TigersJersey | 4:19.73 |
| Heat Number - 6 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 44 | Thomas Wilkinson | 06 | Co Sheffield | 4:17.92 |
| 1 | 46 | Thomas Evans | 06 | Teddington | 4:17.60 |
| 2 | 48 | Wongsakorn Patsamarn | 07 | Plymouth Lea | 4:17.31 |
| 3 | 50 | Davey Unwin | 06 | Stockport Mo | 4:17.02 |
| 4 | 52 | Oliver Rowe | 06 | Mt Kelly | 4:16.84 |
| 5 | 51 | Tom Hawkins | 07 | RTW Monson | 4:16.90 |
| 6 | 49 | Philip Cinpoes | 07 | Kingston Roy | 4:17.26 |
| 7 | 47 | Thomas Flynn | 07 | Barnet Copt | 4:17.44 |
| 8 | 45 | Edward Marcal Whittles | 06 | Chelsea&West | 4:17.80 |
| 9 | 43 | Reuben Alty | 08 | Millfield | 4:18.00 |
| Heat Number - 7 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 55 | George Moore | 06 | Co Leicester | 4:15.76 |
| 1 | 59 | Llewellyn Porter | 08 | Camden Swiss | 4:14.31 |
| 2 | 63 | Matthew Baker | 06 | West Suffolk | 4:12.91 |
| 3 | 67 | Jonathan Turck | 06 | Mt Kelly | 4:10.70 |
| 4 | 71 | Luke Hornsey | 06 | East Lothian | 4:08.72 |
| 5 | 69 | George Pearson | 06 | Wycombe Dist | 4:09.57 |
| 6 | 65 | Scott Fleming | 06 | Eastkilbride | 4:11.39 |
| 7 | 61 | Max Russell | 06 | Co Sheffield | 4:13.88 |
| 8 | 57 | Calum Peebles | 06 | East Lothian | 4:15.05 |
| 9 | 53 | Samuel Grimes | 06 | Wigan BEST | 4:16.73 |
| Heat Number - 8 |
| Lane | Comp.No. | Name | YoB | Club | Time |
| 0 | 56 | Kourosh Khodakhah | 07 | Co Leeds | 4:15.60 |
| 1 | 60 | Jake Tomkins | 06 | Barnet Copt | 4:14.13 |
| 2 | 64 | Samuel Lander | 06 | Bromley | 4:11.93 |
| 3 | 68 | David Annis | 06 | Pershore | 4:10.31 |
| 4 | 72 | James Raw | 07 | Co Leicester | 4:08.24 |
| 5 | 70 | James McClure | 06 | Co Coventry | 4:09.23 |
| 6 | 66 | Jack Jenkinson | 06 | Skipton | 4:11.32 |
| 7 | 62 | Joseph Moment | 06 | KingstonHull | 4:13.36 |
| 8 | 58 | Ivan Hart | 06 | Millfield | 4:14.79 |
| 9 | 54 | Alexandru Lazar | 07 | N & D PP SC | 4:16.17 |