Well eventually got the test done, the Garage had a Fire in the Fuse box, which took out the Electrical system, and ours at work...
So after all that it's fine, 155 Psi in number one, 160 in the rest....
So it is the Carbs, which is after all what I and most other people said it was. It does seem to be a bit more than just adjustments though, maybe the rubber mounts are leaking, which is affecting the air intake balances. Next step is to find a real Weber expert, anybody any recomendations, Yorkshire area, Alwyn Kershaws, and a guy called David Bogg in Malton are my thoughts at the moment.