EVENT 202 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 2 | Archie WIGHTMAN | 13 | Warrington W | 4:57.18 |
| 4 | 4 | Matteo MONACO | 14 | South Lincs | 4:48.79 |
| 5 | 3 | William WILSON | 13 | Co Leeds | 4:46.99 |
| 6 | 1 | Hayden LAM | 13 | Co Leeds | 4:47.09 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 6 | Oscar GAVELLE | 14 | Rotherham Mo | 4:46.68 |
| 1 | 8 | Dilanas SATAVICIUS | 13 | Nuneaton | 4:33.58 |
| 2 | 10 | Alexander HORNBY | 16 | Wigan BEST | DN:C. |
| 3 | 12 | Matthew JAMES | 15 | Co Leeds | 4:33.02 |
| 4 | 14 | Jack PRITCHARD | 16 | Wigan BEST | 4:27.29 |
| 5 | 13 | Oliver WHITTLESTON | 16 | Co Leeds | 4:31.67 |
| 6 | 11 | Layton BROWN | 15 | Nuneaton | 4:31.90 |
| 7 | 9 | Max HENDERSON | 15 | Cockermouth | 4:30.73 |
| 8 | 7 | Matthew SAWERS | 14 | Wigan BEST | 4:35.95 |
| 9 | 5 | Samuel HILL | 14 | Co Leeds | 4:39.52 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 16 | James EDWARDS | 19 | Preston | 4:35.34 |
| 1 | 18 | Alexander VEGA FLORES | 17 | Nuneaton | 4:29.25 |
| 2 | 20 | Benjamin ROSS | 15 | Co Salford | 4:24.06 |
| 3 | 22 | Jack WHITE | 17 | Warrington W | 4:31.15 |
| 4 | 24 | Patrick NEILL | 15 | Co Leeds | 4:19.57 |
| 5 | 23 | Max HARVEY | 16 | Co Liverpool | 4:25.01 |
| 6 | 21 | Oliver SORRELL | 16 | South Lincs | 4:43.87 |
| 7 | 19 | Charlie HINSON | 15 | Co Leeds | 4:33.86 |
| 8 | 17 | Andrew CLAVIS | 16 | LiverpoolPen | 4:23.96 |
| 9 | 15 | Josh PINDER | 16 | Warrington W | 4:47.42 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 27 | Michael WU | 15 | Altrincham | 4:32.77 |
| 1 | 31 | Owen HATHWAY | 17 | Grantham | DN:C. |
| 2 | 35 | George DAINTITH | 15 | Warrington W | 4:21.46 |
| 3 | 39 | Finlay POPE | 16 | Stockport Mo | 4:12.47 |
| 4 | 43 | Davey UNWIN | 17 | Co Manch Aq | 4:13.18 |
| 5 | 41 | Ronnie WEALL | 16 | Warrington W | 4:13.61 |
| 6 | 37 | Daniel JACKSON | 17 | Bo Kirklees | 4:17.55 |
| 7 | 33 | Oscar GOLDSMITH | 15 | South Lincs | 4:28.71 |
| 8 | 29 | George BROOKS | 16 | Co Leeds | 4:17.52 |
| 9 | 25 | Jackson JARDINE | 16 | Cockermouth | DN:C. |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 28 | Alastair JEFFREY | 18 | Satellite | 4:30.42 |
| 1 | 32 | Alfie BISBY | 16 | South Lincs | 4:35.96 |
| 2 | 36 | Samuel SUTCLIFFE | 14 | Ramsbottom | 4:24.61 |
| 3 | 40 | Ben SHELTON | 19 | Co Leeds | 4:20.91 |
| 4 | 44 | Jack JENKINSON | 17 | Skipton | 4:13.00 |
| 5 | 42 | Samuel GRIMES | 17 | Wigan BEST | 4:15.36 |
| 6 | 38 | Nathan LOCKETT | 18 | Co Salford | 4:19.87 |
| 7 | 34 | Alex SADLER | 16 | South Lincs | 4:28.42 |
| 8 | 30 | Simon HARRISON | 15 | Satellite | 4:28.38 |
| 9 | 26 | Daniel JONES | 17 | Wigan BEST | 4:34.71 |