EVENT 303 Mens MC 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | YoB | Cat | Club/Country | Time |
| 3 | 1 | Ethan Naisbitt | 03 | S9 | Pioneer 79 | 1:46.86 |
| 4 | 3 | Jacob Chambers | 03 | S8 | Co Manch Aq | 1:45.20 |
| 5 | 2 | Toben Durrant | 05 | S13 | Co Cardiff | 1:45.27 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | YoB | Cat | Club/Country | Time |
| 1 | 5 | William Whitehead | 05 | S8 | Rotherham Mo | 1:36.30 |
| 2 | 7 | Balthazar Bradshaw | 06 | S10 | Chelsea&West | 1:26.98 |
| 3 | 9 | Samuel Whearty | 02 | S9 | Colchester | 1:25.46 |
| 4 | 11 | Luke Batty | 05 | S9 | Bolton Metro | 1:18.53 |
| 5 | 10 | Charlie Coulam | 03 | S10 | Bridlington | 1:22.60 |
| 6 | 8 | Maximilian Tulloch | 05 | S9 | Chalfont | 1:26.04 |
| 7 | 6 | Liam Hardy | 03 | S14 | Co Manch Aq | 1:31.36 |
| 8 | 4 | James Watson | 04 | S9 | Harrogate | 1:41.42 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | YoB | Cat | Club/Country | Time |
| 1 | 13 | Owen Garsides | 01 | S14 | KingstonHull | 1:13.58 |
| 2 | 15 | Finlay Middleton | 02 | S8 | Mt Kelly | 1:11.93 |
| 3 | 17 | Conor Ballard | 02 | S10 | Leatherhead | 1:09.26 |
| 4 | 19 | Jack Milne | 01 | S14 | Dun City Aqu | 1:02.44 |
| 5 | 18 | Adam Whyborne | 01 | S10 | Billingham | 1:04.39 |
| 6 | 16 | Cameron Vearncombe | 02 | S14 | Newquay | 1:11.88 |
| 7 | 14 | Angus Leckonby | 02 | S14 | Scarborough | 1:13.43 |
| 8 | 12 | Benjamin Grainger | 03 | S10 | Mt Kelly | 1:15.20 |