EVENT 201 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 1 | Oliver WHITTLESTON | 10 | Co Leeds | 6:05.54 |
| 1 | 2 | Theodore ROSENBERG | 10 | Co Leeds | 5:44.83 |
| 2 | 3 | Jamie BROADHURST | 11 | Co Leeds | 5:44.12 |
| 3 | 4 | Dylan PARRY | 14 | Connahs Quay | 5:52.26 |
| 4 | 5 | Evan REEVES | 12 | Darlington | 5:30.17 |
| 5 | 6 | Zak STOLARSKI | 12 | Co Leeds | 5:39.10 |
| 6 | 7 | Harry SENIOR | 11 | Co Leeds | 5:31.74 |
| 7 | 8 | Solomon HODGSON | 11 | Co Leeds | 5:36.92 |
| 8 | 9 | Jacob GOODWIN | 11 | Co Leeds | 5:44.43 |
| 9 | 10 | Maxim VAKOUROV | 15 | Co Leeds | 4:49.62 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 11 | Alex BOYER | 10 | Darlington | 5:17.14 |
| 1 | 12 | Samuel EMMETT | 12 | Co Leeds | 5:06.90 |
| 2 | 13 | James ROBINSON | 12 | Co Leeds | 5:01.08 |
| 3 | 14 | Louis AINLEY | 13 | Co Leeds | 4:48.79 |
| 4 | 15 | Henry FIRTH | 12 | Co Leeds | 5:03.35 |
| 5 | 16 | Simon ROBSON | 13 | York City | 5:01.46 |
| 6 | 17 | Finlay WILLIAMS | 13 | Co Leeds | 4:45.73 |
| 7 | 18 | Jack SENIOR | 13 | Co Leeds | 4:45.66 |
| 8 | 19 | Elliott WATKINS | 12 | Co Leeds | 5:00.33 |
| 9 | 20 | Connor ROBINSON | 15 | Chapeltown | 4:59.97 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 22 | Harry MILNER | 13 | Co Leeds | 4:33.99 |
| 1 | 24 | Daniel BOYER | 15 | Darlington | 4:41.04 |
| 2 | 26 | Barnaby HOWARTH-OSBORN | 13 | Sheffield C | 4:35.33 |
| 3 | 28 | Joe CALLIN | 13 | Team Jorvik | 4:40.04 |
| 4 | 30 | Joseph SENIOR | 17 | Team Jorvik | DN:S. |
| 5 | 29 | Tiago LAWRIE | 16 | Trafford Met | 4:24.44 |
| 6 | 27 | Jamie BROOME | 15 | Co Leeds | 4:29.98 |
| 7 | 25 | Robbie ABBOTT | 15 | Halifax | 4:38.20 |
| 8 | 23 | Ben SHELTON | 13 | Co Leeds | 4:30.59 |
| 9 | 21 | Emilio PANIAGUA-GUTIER | 13 | Co Leeds | 4:31.47 |