EVENT 502 Open/Male 200m Butterfly - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Alidar KOZHAMZHAROV | 13 | Willesden | |
| 2 | 3 | Theo RAWNSLEY | 9 | Harpenden | 3:37.93 |
| 3 | 5 | Alexander THANASSOULAS | 14 | Willesden | 3:01.22 |
| 4 | 7 | Ayden ROUMILHAC | 13 | Willesden | 2:55.09 |
| 5 | 6 | Adithya BANGERA | 14 | Epping For't | 3:00.10 |
| 6 | 4 | George DAVEY-CROUCH | 13 | Bo Southend | 3:05.00 |
| 7 | 2 | Theo TSANG | 12 | Ealing | |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 9 | Sebastian MILLER | 13 | Ealing | 2:50.60 |
| 2 | 12 | Liam BAUTISTA | 16 | Epping For't | 2:40.00 |
| 3 | 14 | Alexander BELNIKOFF | 15 | Epping For't | 2:33.35 |
| 4 | 16 | Harrison SHAW | 17 | Flitwick | 2:09.50 |
| 5 | 15 | Daniel MEIER | 17 | Biggleswade | 2:20.36 |
| 6 | 13 | Casper WHITTAKER | 12 | Biggleswade | 2:38.80 |
| 7 | 11 | Sami BOUKHTOUCHE | 12 | Ealing | 2:45.50 |
| 8 | 8 | Samuel CHILDS | 12 | Berkhamsted | 2:52.29 |