Bottom post of the previous page:
Visited:Thruxton (2006, 2008)
Castle Combe (2000)
Pembrey (1997, 1998)
Walt Disney World Speedway (1996, 1998, 2000 - well, driven right past it, I suppose that counts as visiting)
Also if you're counting rallying - Rally GB:
St Gwynno stage 1997
Cardiff Superspecial stage 2001
Visited the services in 1997 (Resolven), 2000 (Swansea) and 2003 (Felindre)