EVENT 102 Open/Male 09 /Over 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 2 | 2 | Michael FISHER | 12 | Hitchin | 1:59.06 |
| 3 | 4 | Christian GIROTTO | 12 | Co St Albans | 1:43.13 |
| 4 | 6 | Jonas Chor Hang TING | 11 | Verulam | 1:34.42 |
| 5 | 5 | Ben BARTLETT | 11 | Cheshunt | 1:40.00 |
| 6 | 3 | Noah TANG | 12 | Co St Albans | 1:47.30 |
| 7 | 1 | Jack MCDONALD | 13 | Potters Bar | 2:01.46 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 8 | Thomas EVANS | 12 | Verulam | 1:31.91 |
| 2 | 10 | Darby GREANEY | 10 | Co St Albans | 1:30.00 |
| 3 | 12 | Arthur PROCTER | 11 | Co St Albans | 1:25.00 |
| 4 | 14 | Dominic MONOVSKI | 12 | Hoddesdon | 1:20.00 |
| 5 | 13 | Arthur HUNTLEY | 13 | Co St Albans | 1:22.00 |
| 6 | 11 | Harry EASTON | 13 | Cheshunt | 1:28.30 |
| 7 | 9 | Atticus WALTERS GOW | 12 | Co St Albans | 1:31.12 |
| 8 | 7 | Elliot JOHN | 13 | Stevenage | 1:32.96 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 16 | Euan ROBERTS | 15 | Hoddesdon | 1:12.84 |
| 2 | 18 | Oliver TUBRIDY | 15 | Stevenage | 1:11.47 |
| 3 | 20 | Jesse HOWARD | 16 | Hoddesdon | 1:08.75 |
| 4 | 22 | Alfie BULLOCK | 18 | Cheshunt | 1:02.69 |
| 5 | 21 | Mikhail ZHARINOV | 16 | Hitchin | 1:04.58 |
| 6 | 19 | Matas ZILINSKAS | 15 | Cheshunt | 1:09.66 |
| 7 | 17 | Daniel HILLMAN | 15 | Cheshunt | 1:11.79 |
| 8 | 15 | John HOMAN-DALY | 11 | Co St Albans | 1:18.87 |