Could be steve, not sure until I have the cover off, if that was the case I would expect the starter motor to turn the engine over and the pulley to turn around the cam without driving it, at the moment, it sounds like the crank is turning around with no effect on the cambelt - I think the camshaft broke, seized (maybe) and stripped belt teeth at the crankshaft end

Shit luck indeed - teach me to DIY this kinda thing.

You live and learn I suppose

So, what's the correct way of putting a cam back in then ? Fully tighten the first cam cap, then second, third and fourth, or, do them up slowly and evenly working from front to back until they are all tight ?

I think I did the exhause the first way and the inlet the second, thinking it would be less stress on the camshaft

I am going to have to find out if I get round to repairing it...