EVENT 103 Open/Male 100m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 3 | Abhimanyu KULKARNI | 12 | Amersham | |
| 2 | 5 | Benjamin MELLORS | 13 | Verulam | |
| 3 | 7 | Wai Chun LAU | 11 | Verulam | |
| 4 | 9 | Austin BATER | 11 | Amersham | 2:09.75 |
| 5 | 8 | Wai Lok LAU | 13 | Verulam | |
| 6 | 6 | Oliver MILLS | 10 | Amersham | |
| 7 | 4 | Louis ROYALL | 14 | Team Luton | |
| 8 | 1 | Lucas SMITH | 11 | Amersham | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 11 | George HING | 11 | Bedford SS | 1:35.58 |
| 2 | 13 | Khaled ALLAM | 13 | Bedford SS | 1:30.20 |
| 3 | 15 | Ethan HUNTLEY | 13 | Team Luton | 1:21.50 |
| 4 | 17 | Thomas ANDREWS | 14 | Amersham | 1:19.39 |
| 5 | 16 | Zoran BUTORAC | 13 | Camden Swiss | 1:19.70 |
| 6 | 14 | Luke TRULL | 12 | Dunstable | 1:26.49 |
| 7 | 12 | Kuba KOPEC | 11 | Bedford SS | 1:30.29 |
| 8 | 10 | Mazen ALLAM | 11 | Bedford SS | 1:50.00 |
| Heat Number - 3 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 19 | Jesse KEEN | 15 | Amersham | 1:18.91 |
| 2 | 21 | Hanz Dylan MARCELO | 13 | Dunstable | 1:16.06 |
| 3 | 23 | Luc BONFIGLIO | 13 | Camden Swiss | 1:12.00 |
| 4 | 26 | Finn MATHERS | 13 | Camden Swiss | 1:09.50 |
| 5 | 25 | Daniel DALY | 13 | Camden Swiss | 1:11.30 |
| 6 | 22 | Philip BORISOV | 13 | Camden Swiss | 1:12.21 |
| 7 | 20 | Rafe LAWSON | 12 | Berkhamsted | 1:17.50 |
| 8 | 18 | Anuhas Nirvan MEEPAGE | 14 | Co Milton K | 1:19.00 |
| Heat Number - 4 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 28 | Dominic STACHURA | 17 | Dunstable | 1:07.50 |
| 2 | 30 | William WARD | 14 | Hoddesdon | 1:07.03 |
| 3 | 34 | Leonardo DIALLO | 15 | Camden Swiss | 1:04.80 |
| 4 | 36 | Ellis BUNCE | 16 | Aylesbury | 1:03.17 |
| 5 | 35 | Adam O'NEAL | 16 | Bedford SS | 1:04.75 |
| 6 | 32 | Finley PARKER | 15 | Co Milton K | 1:06.90 |
| 7 | 29 | Malachy HITCHCOCK | 16 | Camden Swiss | 1:07.10 |
| 8 | 27 | Henry GILLAM | 14 | Camden Swiss | 1:07.60 |