Jonny,
I got your pm but you have blocked receipt of replies. I have sent to your e mail addy as you provided thanks.
As far as Gp1 is concerned the UK regs changed in 1975 to restrict the over 3500cc cars and allow further mods to suspension etc. Pre 1974, there were more restricions, although you could remove bumpers etc. which you had to retain post 1974. So, by moving the dates backwards you will get Camaros, Capris Mk1, 2 and 3, Escort RS1600, RS 1800 and 2000. So I'd recommend a cut off around 1973.
Clearly the group 1 cars will be outgunned by everything else on the grid but hey ho.
Cheers
Peter
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