www.eerc.co.uk
Check out one of a few Britcar threads on here - some long ones! I'll find them and link here in a sec if you like (and then perhaps someone could merge or make this a Britcar 2005 thread!).
Threads:
http://tentenths.com/forum/showthrea...hlight=britcar
http://tentenths.com/forum/showthrea...hlight=britcar
http://tentenths.com/forum/showthrea...hlight=britcar
There are more, but these are the ones with the most substance!