Does the car crank now? Has the n.a.t.s fault been resolved? Am I right in saying you have already changed the camshaft sensor?
I suggest the next step you take is to inspect the timing chain tensioner, it's not really easy to get to as you have to remove the drivers headlight and engine mounting.
We bought a Lucas timing chain kit from euro car parts for around £100 - it took the mechanics a full day to do
So as these cars aren't worth much anymore I'd suggest you Inspect the chain tensioner and take it from there.
My mechanic was adamant that my chain wasn't stretched which put even more doubt into my head.
