EVENT 204 Boy Open 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 1 | Jack RYAN | 13 | Eckington | 1:48.00 |
| 3 | 3 | Max MARSHALL | 12 | Matlock | 1:39.74 |
| 4 | 2 | C BUTTERELL-QUANBROUGH | 11 | Bassetlaw SS | 1:40.41 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 4 | Joshua BOOTH | 13 | Rotherham Mo | 1:28.60 |
| 2 | 6 | Jake HOTHAM | 15 | Matlock | 1:26.69 |
| 3 | 8 | Oscar GAVELLE | 12 | Rotherham Mo | 1:25.41 |
| 4 | 7 | Samuel GREEN | 11 | Bassetlaw SS | 1:25.41 |
| 5 | 5 | Finlay BIRD | 11 | Derventio | 1:27.84 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | William DURRANS | 14 | Rotherham Mo | 1:20.25 |
| 2 | 12 | Harrison DEEKS | 14 | Rotherham Mo | 1:14.78 |
| 3 | 14 | Jack DENWOOD | 15 | Rotherham Mo | 1:10.67 |
| 4 | 13 | Zac OAKES | 17 | Newcastle St | 1:12.88 |
| 5 | 11 | Leon LOUW | 16 | Bircotes SC | 1:15.00 |
| 6 | 9 | Layne KEYWORTH | 13 | Bassetlaw SS | 1:20.60 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Brandon HOTHAM | 17 | Matlock | 1:03.60 |
| 2 | 18 | Alexander HARRAND | 16 | Derventio | 1:03.13 |
| 3 | 20 | Malachy MCGUINNESS | 18 | Bassetlaw SS | 1:00.72 |
| 4 | 19 | Scott PATTYSON | 16 | Newcastle St | 1:01.86 |
| 5 | 17 | Oliver OSBORNE | 14 | Derventio | 1:03.20 |
| 6 | 15 | Oliver STONE | 13 | Derventio | 1:07.22 |