[John W]

Just seen your reply, thanks for the further thoughts and I agree, that would have been my next step. Its in the hands of the dealers now though.

I can't explain the rattling noise that I thought was a follower, unless of course its eaten a ring...

Because i was unhappy they had not done as asked in July I requested to be called when the cam cover was removed so I could see for myself what state it was in. All looked ok.
Hopefully they will allow me to see the heads / barrels once they are removed too.

Time will tell just what it is,but in the mean time I'm trying to get the info the dealers are working to.
My big concern still remains that this would not have been found even at the service intervals unless I had done the comp check off my own back and pushed for them to follow it up.