Hobson - as promised - try some of these:-
http://www.195.188.200.200/v2/resources.asp?
If that doesn't get you to the Bentleys, put SCGT and MOFNET into Google and you should find it.
Also:-
http://discpad.homestead.com
This was a fantastic SCGT resource but it seems to be out of action at the moment. Worth checking back though, now and again.
These are good too:-
http://simracingconnection.virtualav...cgt/links.html
http://www.historicscgt.homestead.com/home.html
http://people.ne.mediaone.net/mlapp/index.html
http://home.freeuk.net/jrknight/scgt/
http://members.home.net/xzibit.a/scgt/
And for GP3 lovers, this is the place to go:-
http://www.alphaf1.com/gp3/
Hope these help.
(Failing all else, just type SCGT downloads (or GP3 downloads) into Google and you will find all sorts of sites. Don't forget when you get to a site to check out the inevitable links page as well!)