EVENT 201 Boys Open 400m Freestyle - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | William BROWNING | 17 | Tadcaster | 7:43.00 |
| 4 | 3 | Ewan WEAVER | 13 | Aquabears | 7:07.77 |
| 5 | 2 | Oliver KEENS | 10 | Rotherham Mo | 7:30.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 5 | Yuvraj UBHI | 9 | Co Leeds | 6:50.00 |
| 1 | 7 | William HICKLIN | 10 | Co Leeds | 6:34.60 |
| 2 | 9 | Christopher BARNETT | 11 | Co Wakefield | 6:30.00 |
| 3 | 11 | Sam WRIGHT | 11 | Tadcaster | 6:19.43 |
| 4 | 13 | Jacob O'DONNELL | 9 | Co Leeds | 6:17.60 |
| 5 | 12 | Koby ORD | 11 | Rotherham Mo | 6:18.00 |
| 6 | 10 | Mason STOCKS | 10 | Aquabears | 6:20.75 |
| 7 | 8 | Lucas PIERCY | 11 | Co Leeds | 6:30.61 |
| 8 | 6 | Oscar GAVELLE | 10 | Rotherham Mo | 6:47.97 |
| 9 | 4 | Oliver BROOKE | 10 | Co Leeds | 6:58.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 15 | Lewis SMITH | 13 | Rotherham Mo | 6:10.00 |
| 1 | 17 | James HENDON | 11 | Tadcaster | 6:06.74 |
| 2 | 19 | Joseph HALL | 11 | Co Leeds | 5:55.52 |
| 3 | 21 | Hari MONTGOMERY | 12 | Co Leeds | 5:49.00 |
| 4 | 23 | Oliver GOODISON | 11 | Co Leeds | 5:44.98 |
| 5 | 22 | Joshua BARLOW | 11 | Co Leeds | 5:46.20 |
| 6 | 20 | Oliver AUSTIN | 11 | Bo Barnsley | 5:54.07 |
| 7 | 18 | Dexter ROSENBERG | 10 | Co Leeds | 6:02.80 |
| 8 | 16 | William WILSON | 9 | Co Leeds | 6:09.00 |
| 9 | 14 | Joshua BOOTH | 11 | Rotherham Mo | 6:16.32 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 25 | Maxwell FORD | 11 | Co Leeds | 5:40.80 |
| 1 | 27 | Luke DYER | 12 | Co Leeds | 5:19.57 |
| 2 | 29 | Cody INGRAM | 13 | Bo Barnsley | 5:05.50 |
| 3 | 31 | Ethan ROBERTS-CUTTS | 15 | Chapeltown | 5:00.13 |
| 4 | 33 | Luke GILLIVER | 12 | Donc Dartes | 4:48.24 |
| 5 | 32 | Cameron RHODES | 14 | Rotherham Mo | 4:49.50 |
| 6 | 30 | Theodore ROSENBERG | 12 | Co Leeds | 5:03.90 |
| 7 | 28 | Nathan DULAY | 13 | Co Leeds | 5:18.96 |
| 8 | 26 | Nathan MARTIN | 13 | Chapeltown | 5:39.93 |
| 9 | 24 | Alfie STRATTON | 11 | Grimsby AST | 5:42.49 |
| Heat Number - 5 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 35 | Daniel BAILEY | 16 | Donc Dartes | 4:43.80 |
| 1 | 37 | Connor ROBINSON | 17 | Chapeltown | 4:41.33 |
| 2 | 39 | James DOBNEY | 15 | Grantham | 4:33.40 |
| 3 | 41 | George KNOWLES | 14 | Co Leeds | 4:32.45 |
| 4 | 43 | Ajay SCOTT | 16 | Donc Dartes | 4:27.70 |
| 5 | 42 | Zackary MERRITT | 17 | Donc Dartes | 4:31.70 |
| 6 | 40 | Simon ROBSON | 15 | York City | 4:33.30 |
| 7 | 38 | Maxwell DE'ATH | 16 | Tadcaster | 4:40.76 |
| 8 | 36 | Joshua LATHAM | 15 | Aquabears | 4:42.70 |
| 9 | 34 | Jonathon WIGHTMAN | 15 | Bo Barnsley | 4:45.51 |