EVENT 202 Boy Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 1 | 1 | Matteo MONACO | 13 | | South Lincs | 5:00.30 |
| 2 | 3 | Luke KAVANAGH | 14 | | Wirral Metro | 4:56.90 |
| 3 | 5 | Jack BIGNELL | 14 | | Northampton | 4:48.62 |
| 4 | 7 | Matthew JAMES | 14 | | Co Leeds | 4:45.53 |
| 5 | 6 | Layton BROWN | 14 | | Nuneaton | 4:46.53 |
| 6 | 4 | Euan FLANNERY | 13 | | Warrington W | 4:53.10 |
| 7 | 2 | Dilanas SATAVICIUS | 12 | | Nuneaton | 4:59.10 |
| 8 | 12 | Ethan NAISBITT | 19 | S9 | Co Manch Aq | 5:34.26 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 9 | Jack WHITE | 16 | | Warrington W | 4:35.40 |
| 1 | 11 | Dylan FUNG | 15 | | Stockport Mo | 4:33.60 |
| 2 | 14 | Oscar GOLDSMITH | 14 | | South Lincs | 4:31.20 |
| 3 | 16 | Thomas BRUCE | 16 | | South Lincs | 4:29.30 |
| 4 | 18 | Charlie COLLINS | 16 | | Wigan BEST | 4:27.40 |
| 5 | 17 | Samuel SMITH | 15 | | Skipton | 4:27.78 |
| 6 | 15 | Alex SADLER | 15 | | South Lincs | 4:31.06 |
| 7 | 13 | George DAINTITH | 14 | | Warrington W | 4:31.90 |
| 8 | 10 | Finlay WILLIAMS | 18 | | Co Leeds | 4:35.35 |
| 9 | 8 | Daniel KHODAVERDI | 13 | | Stockport Mo | 4:35.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 21 | William POYSER | 17 | | Leic Sharks | 4:25.00 |
| 1 | 25 | Luke STEVENS | 16 | | Leic Sharks | 4:20.90 |
| 2 | 29 | James PLANT | 16 | | Bo Kirklees | 4:17.05 |
| 3 | 33 | Jacob MILLS | 15 | | Leic Sharks | 4:16.20 |
| 4 | 37 | Davey UNWIN | 16 | | Stockport Mo | 4:13.30 |
| 5 | 35 | Jacob ATKINSON | 18 | | Stockport Mo | 4:13.69 |
| 6 | 31 | Benjamin ROGERS | 17 | | RichmondDale | 4:16.60 |
| 7 | 27 | Noah SOUTHGATE | 18 | | Boldmere | 4:18.30 |
| 8 | 24 | Matthew WARBURTON | 17 | | Warrington W | 4:22.40 |
| 9 | 19 | Alfie BISBY | 15 | | South Lincs | 4:27.30 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Cat | Club | Time |
| 0 | 22 | Finlay POPE | 15 | | Stockport Mo | 4:23.40 |
| 1 | 26 | Daniel JENKINS | 18 | | Boldmere | 4:19.30 |
| 2 | 30 | Luke CLEGG | 17 | | Bo Kirklees | 4:16.70 |
| 3 | 34 | Ronnie WEALL | 15 | | Warrington W | 4:15.80 |
| 4 | 38 | Razvan GRUMAZESCU | 18 | | Northampton | 4:11.80 |
| 5 | 36 | Luke CRITCHLOW | 17 | | Stockport Mo | 4:13.50 |
| 6 | 32 | Evagelos XYNARIANOS | 19 | | Stockport Mo | 4:16.50 |
| 7 | 28 | Tom MCCABE | 17 | | Stockport Mo | 4:17.10 |
| 8 | 23 | Alex KEEBLE | 18 | | Leic Sharks | 4:22.40 |
| 9 | 20 | Daniel MENZER | 19 | | Bo Barnsley | 4:26.75 |