Open/Male - Long Course - 50m Butterfly - Camden Swiss Cottage SC - 12 Years Age Group - At 31st December 2020
| Rank | Name | Ranked Club | YoB | Meet Name | Venue | Level | Date | Time | FINA |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Llewellyn Porter | Camden Swiss | 08 | Derby Excel New Year Meet 2024 | Sheffield | 1 | 21/01/24 | 26.21 | 613 |
| 2 | Amir Jelbaoui | Camden Swiss | 08 | City of Sheffield SS Premier Open Meet 2024 | Sheffield | 1 | 10/03/24 | 27.52 | 529 |
| 3 | Hubert Pytlowany | Ealing | 08 | Swim England National Summer Meet 2023 | Sheffield | 1 | 06/08/23 | 27.91 | 508 |
| 4 | Cillian Bramham | Camden Swiss | 08 | Newham & UEL SC National Qualifier Open Meet 2024 | Stratford | 1 | 23/03/24 | 28.31 | 486 |
| 5 | Sauren Singh | Camden Swiss | 08 | Newham & UEL SC National Qualifier Open Meet 2024 | Stratford | 1 | 23/03/24 | 28.42 | 481 |
| 6 | Sapir Pasheli | Camden Swiss | 08 | 2024 Middlesex County Championships | London | 1 | 27/01/24 | 29.90 | 413 |
| 7 | Malachy Hitchcock | Camden Swiss | 08 | Cardiff International Open Meet 2023 | Cardiff | 1 | 20/05/23 | 32.96 | 308 |