Timing belt all ok, camshaft is turning apparently, mechanic thinks the 'something' key, sorry can't remember what he called it, might have sheered and caused the timing to have slipped, anyway that's his next investigation before removing cylinder head. I did ask if faulty crank sensor could be a factor and he thought not. I wondered if new, and obviously stronger, valve springs following overhaul could perhaps have caused extra stress. I'm just waiting to hear what the conclusions are but thought others might have experienced a similar problem and found the cause, could save garage time (=money!).
Thanks all of you for going to the trouble of replying.
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