I've stuck this in Mech & Elec as i think its got a better chance of finding the correct market!
Surfing about as you do, found the Yorkshire Rally Spares www and it has a Vauxhall dedicated section!
Currently the 6th item down:-
Pr 3.0 V6 cams, gen Vaux brand new in boxes, performance upgrade for 2.5 £100
I'm sure thats a bargain just waiting to be snapped up by somebody on here