| Philip Aldwinckle | 1:31.01 | 1998-04-04 | aged 9 | Herts Age Groups |
| Philip Aldwinckle | 1:29.29 | 1999-01-22 | aged 10 | Potters Bar IM meet |
| Alex Lodge | 1:29.12 | 2000-06-03 | aged 10 | Colchester Open |
| Jack George | 1:28.76 | 2001-03-11 | aged 10 | Age Groups 4, 5 & 6 |
| Jack George | 1:25.38 | 2001-04-27 | aged 10 | Edmonton Phoenix Open |
| Jack George | 1:24.05 | 2001-06-02 | aged 10 | Colchester Open |
| Jake Robinson | 1:23.29 | 2004-11-21 | aged 10 | Hitchin Open |
| Jake Robinson | 1:23.16 | 2005-01-23 | aged 10 | Biggleswade Open |
| Jake Robinson | 1:20.87 | 2005-03-06 | aged 10 | Age Groups 3 & 4 |