EVENT 201 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Matthew BURGESS | 12 | Darlington | 5:54.14 |
| 1 | 3 | Ben JOHNSON | 13 | Wirral Metro | 5:27.10 |
| 2 | 5 | Freddie BROOK | 13 | York City | 5:07.84 |
| 3 | 7 | Evan REEVES | 14 | Darlington | 5:01.30 |
| 4 | 9 | Oliver CREIGHTON | 14 | York City | 4:57.34 |
| 5 | 8 | Joseph MOMENT | 13 | Scarborough | 4:57.67 |
| 6 | 6 | Solomon HODGSON | 13 | Co Leeds | 5:05.68 |
| 7 | 4 | William BACON | 14 | Co Leeds | 5:09.12 |
| 8 | 2 | Arron SIMPSON | 12 | Long Eaton | 5:41.70 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Henry FIRTH | 14 | Co Leeds | 4:51.52 |
| 1 | 13 | Alexander HARRAND | 14 | Long Eaton | 4:49.10 |
| 2 | 15 | Samuel EMMETT | 14 | Co Leeds | 4:46.12 |
| 3 | 17 | Elliott WATKINS | 14 | Co Leeds | 4:45.12 |
| 4 | 19 | Aaron RUBY | 13 | Co Birm'ham | 4:42.10 |
| 5 | 18 | William POYSER | 14 | Leic Sharks | 4:44.16 |
| 6 | 16 | Lucas WALIGORA | 14 | York City | 4:45.82 |
| 7 | 14 | Dariush KHODAKHAH | 14 | Co Leeds | 4:48.12 |
| 8 | 12 | Kourosh KHODAKHAH | 12 | Co Leeds | 4:50.98 |
| 9 | 10 | Callum BROADHEAD | 12 | Donc Dartes | 4:51.74 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 21 | Harvey PENNINGTON | 14 | Skipton | 4:40.60 |
| 1 | 23 | Charlie MILLER | 14 | Skegness | 4:32.90 |
| 2 | 25 | Harvey HIGGINS | 14 | Co Birm'ham | 4:31.60 |
| 3 | 27 | Jamie BROOME | 17 | Co Leeds | 4:28.07 |
| 4 | 29 | Nathan BUNKLE | 15 | York City | 4:26.44 |
| 5 | 28 | Harris LISTER | 16 | York City | 4:27.90 |
| 6 | 26 | Harry COURTNEY | 14 | Tynedale | 4:30.84 |
| 7 | 24 | Sean MCCANN | 14 | Co Leicester | 4:32.40 |
| 8 | 22 | George KNOWLES | 14 | Co Leeds | 4:40.40 |
| 9 | 20 | Dominic MATHIAS | 14 | Co Leeds | 4:41.60 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 32 | George LOWE | 16 | Co Leicester | 4:22.80 |
| 1 | 36 | Barnaby HOWARTH-OSBORN | 15 | Sheffield C | 4:19.50 |
| 2 | 40 | Aron PREECE | 20 | Nova Cent'n | 4:14.00 |
| 3 | 44 | Joey TIPPIN | 16 | Co Leicester | 4:11.50 |
| 4 | 48 | Niall COULTHARD | 16 | Sedgefield | 4:07.42 |
| 5 | 46 | Joshua SKINNER | 16 | Nova Cent'n | 4:11.30 |
| 6 | 42 | Joseph KINGSLAND | 16 | Nova Cent'n | 4:12.70 |
| 7 | 38 | Ryan WILCOX | 17 | Nova Cent'n | 4:16.88 |
| 8 | 34 | Zak SMITH-SHELLEY | 17 | Pioneer 79 | 4:20.80 |
| 9 | 30 | Johnson BACHE | 16 | Darlington | 4:25.20 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 33 | Luke JEAL | 16 | Leic Sharks | 4:22.68 |
| 1 | 37 | Liam DAWSON | 14 | Nova Cent'n | 4:19.40 |
| 2 | 41 | Joel WESTON | 19 | Co Leicester | 4:13.48 |
| 3 | 45 | Dalton CLAPHAM | 16 | Co Leeds | 4:11.44 |
| 4 | 49 | Joseph SADLER | 16 | Nova Cent'n | 4:06.80 |
| 5 | 47 | Ethan SUTCLIFFE | 16 | Co Leeds | 4:10.70 |
| 6 | 43 | Andrew HALL | 16 | Nova Cent'n | 4:12.60 |
| 7 | 39 | Kieran SUMMERS | 16 | Scunthorpe A | 4:16.70 |
| 8 | 35 | Aidan MITCHELL | 16 | Co Birm'ham | 4:20.60 |
| 9 | 31 | Acer WOOLLEY | 16 | Co Birm'ham | 4:25.02 |