When I play online, I mostly play on Dragon Go Server. If I've got it right, then this link will let you challenge me. It will probably help if you have a logged-in DGS cookie.
Offline, I mostly play go at the Winchester Go Club.
The BGA have a strength graph for me which takes into account all the BGA-sponsored tournaments I've played in here. Assuming linear progress, I should be amateur 7-dan sometime next year.