Thanks Dennis & Adrian, great info here
yes I have blocked off the breather that goes from the "frying pan " to the inlet manifold, I,ll check all the diaphragms tomorrow & with a bit of luck, thru a process of elimination of the all the points raised I,ll find the culprit,
I,d really like my new tyres
so hopefully this won,t break my squeeky budget
thanks guys
cheers
andy