EVENT 104 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 3 | 1 | David KANDELAKI | 12 | Linslade | |
| 4 | 3 | Ellis GLANTZ | 9 | Putteridge | 1:44.90 |
| 5 | 2 | Andrei GHEORGHE | 12 | Newport Pag | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 7 | Tom GILBERT | 12 | Watford SC | 1:35.80 |
| 2 | 9 | Cody BRIGDEN | 11 | Watford SC | 1:33.00 |
| 3 | 11 | Archie LAKE | 12 | New Hall | 1:29.16 |
| 4 | 13 | Ethan HUNTLEY | 12 | Team Luton | 1:26.69 |
| 5 | 12 | Austin CHRISTOPHER | 11 | Newport Pag | 1:26.90 |
| 6 | 10 | Granth KARMACHARYA | 12 | Bushey | 1:32.30 |
| 7 | 8 | Olajuwon DREW-SMITH | 12 | New Hall | 1:34.20 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 15 | Rhys HO | 12 | Newport Pag | 1:21.20 |
| 2 | 17 | Casper WHITTAKER | 11 | Biggleswade | 1:19.88 |
| 3 | 19 | Montgomery BREWSTER | 11 | Watford SC | 1:17.70 |
| 4 | 21 | George HEARN | 14 | Dunstable | 1:14.00 |
| 5 | 20 | Joseph FINNERTY | 16 | Linslade | 1:14.70 |
| 6 | 18 | ISAAC GOLD | 15 | Broomfield | 1:18.10 |
| 7 | 16 | Charles HALLAM | 11 | Harpenden | 1:19.90 |
| 8 | 14 | Aaron RAWNSLEY | 12 | Harpenden | 1:25.50 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 23 | Xavier ZERBAN | 13 | Biggleswade | 1:12.51 |
| 2 | 26 | Cub MADDISON | 17 | Harpenden | 1:11.00 |
| 3 | 28 | Emmanuel KOLOBIUS | 14 | Team Luton | 1:07.60 |
| 4 | 31 | Jack BARNARD | 18 | Watford SC | 1:00.60 |
| 5 | 30 | Billy MEAD | 19 | Linslade | 1:01.91 |
| 6 | 27 | Oliver STREET | 16 | Linslade | 1:10.95 |
| 7 | 24 | JASPER TUMANI | 18 | Broomfield | 1:11.50 |
| 8 | 22 | Alexander NIMALATHASAN | 15 | Linslade | 1:13.66 |