Hi Andrew,
If I can suggest u my tip...consider the good think to have near u a producer (as Andy from Tornado is).
I saw some of his ts40 in le mans,they are really wonderful (Ian's red car was a Tornado if I was not wrong)
Too many guys here always thanks Andy in the great support he gaves to anybody has a 40 (not only his wonderful ones).
Probably just think before about what kind of gt40 u would like to have in your garage, maybe something useful for everyday or something similar to incredible GTD rockets in hill climbs.
My tip is to remain on something british (u all know guys how much I love everything...from SPF to Fran masterpieces),and surely join one,or better both
the 2 Uk club.
U will found a lot of GREAT people inside and too many will help u from minor details to racecar setups.
Just my tip
Paolo