All is now sorted, the spigot bush was indeed well worn and I think that was the main issue. Reconditioned clutch assy fitted (sourced from G.E.E. Ltd). I also modified the alloy housing where the sliding collar actuating peg wears a groove in it. I followed the advice I found on the net and fabricated a brass wear plate, the action is now silky smooth. I have also fitted a 15" steering wheel which is so much nicer to use and gives much easier access to the vehicle.

Nev.