Hi Jack,
Thanks for your reply. I agree regarding unbolting the motor and having a look - I've been keen for some time to do a full rebuild and this may be the necessary catalyst. There is a fair amount of cone travel in the clutch (in my opinion), and I believe the cork cutter clutch lining was replaced when I purchased the mower (some 18 months ago). I'm going to go make a few adjustments now but I think the best course of action is a rebuild - I suspect there may be a few parts that are on the way out so I'd feel more comfortable just doing the whole lot!
Will keep you updated.
Kenny.