EVENT 17 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Max SOUSA | 11 | Gwich Royals | 2:00.91 |
| 3 | 3 | William SPINKS | 12 | Herne Bay | 1:57.09 |
| 4 | 4 | Adrian IANCULESCU | 11 | Gravesend | 1:54.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 5 | Frederick KEELAN | 10 | Gwich Royals | 1:53.10 |
| 2 | 6 | Harry CRAWFORD | 10 | Bromley | 1:49.01 |
| 3 | 7 | Jesse NALEPA | 11 | Gwich Royals | 1:48.26 |
| 4 | 8 | Albert MACK | 10 | Gwich Royals | 1:45.56 |
| 5 | 9 | Jack MILLAR | 11 | Bromley | 1:42.60 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 10 | Peter ANDRIANOV | 11 | Gwich Royals | 1:42.03 |
| 2 | 12 | Denis VOSKRESENSKIY | 13 | Bexley | 1:37.67 |
| 3 | 13 | Lucian WILLIAMS | 12 | Saxon Crown | 1:37.58 |
| 4 | 14 | Gustaw NOWACKI | 13 | Bexley | 1:35.97 |
| 5 | 15 | Daniel NICHOLSON | 13 | Gwich Royals | 1:35.38 |
| 6 | 16 | Jan KUDLA | 13 | Gwich Royals | 1:35.05 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 18 | Reece BEADLE | 14 | Bexley | 1:31.57 |
| 2 | 22 | Joseph WARMAN | 12 | Saxon Crown | 1:23.21 |
| 3 | 25 | Ethan BERENGER-FLEMING | 14 | Bromley | 1:13.00 |
| 4 | 24 | Toby SIMMONS | 13 | Gravesend | 1:19.27 |
| 5 | 21 | Kerem KUCUKKARAMUKLU | 14 | Saxon Crown | 1:25.38 |
| 6 | 17 | Edward NICHOLSON | 13 | Gwich Royals | 1:32.47 |