Thanks Grockle
I was worried it had more to do with a bad stall due to a very bad heal and toe attempt.
I do get the small clunk when accelerating gently and changing up, hard acceleration not a problem as all the slack is taken up by inertia of all the drive train components I think.
I'm just suffering 3W hypochondria. Must be the fact I now have 15 k on the clock and nothing's gone wrong for over 6000 mls. Still love the old girl and can't wait to take her out tomoz.