Open/Male - Long Course - 400m Individual Medley - Camden Swiss Cottage SC - 10 Years Age Group - At 31st December 2018
| Rank | Name | Ranked Club | YoB | Meet Name | Venue | Level | Date | Time | FINA |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Llewellyn Porter | Camden Swiss | 08 | British Summer Championships | Sheffield | 1 | 25/07/23 | 4:34.09 | 692 |
| 2 | Cillian Bramham | Camden Swiss | 08 | Newham & UEL SC National Qualifier Open Meet 2024 | Stratford | 1 | 24/03/24 | 5:05.26 | 501 |