In reply to Dave Perry:
Now's probably a good time to tell my cam belt story (or not).
I had an Alfasud (2 actually - spares for the first). Belt went one day ( I seem to remember they had 2 external belts), not too much damaged so being a 'home mechanic' I got the valves straightened, head skimmed etc. and put the new ones on.
She fired first time; only to draw in the rag I'd left on the engine around the new belt and snap it again - back to square one....
A much easier job than the GT Junior repair - but that's a different story.