Open/Male - Long Course - 400m Freestyle - 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 | Speedo Aquatics GB Swimming Championships 2024 | London | 1 | 02/04/24 | 4:01.28 | 758 |
| 2 | Cillian Bramham | Camden Swiss | 08 | City of Sheffield SS Premier Open Meet 2024 | Sheffield | 1 | 10/03/24 | 4:25.05 | 572 |
| 3 | Hubert Pytlowany | Ealing | 08 | 2024 Middlesex County Championships | London | 1 | 27/01/24 | 4:34.24 | 516 |
| 4 | Sauren Singh | Camden Swiss | 08 | 2024 Middlesex County Championships | London | 1 | 27/01/24 | 4:35.20 | 511 |
| 5 | Malachy Hitchcock | Camden Swiss | 08 | Cardiff International Open Meet 2023 | Cardiff | 1 | 20/05/23 | 5:01.68 | 388 |