Cam belt, what a poor design fault, I wonder what the most expensive one to change ??

[Martyn_n]

I'm no expert, as you know but the chains must surely stretch. Certainly, the final drive chain on every motorcycle I ever owned needed regular tensioning to account for stretch and I can't see how a cam chain would differ.

Don't want to get personal, but I suspect you are a bit heavier than a camshaft

 

[nick mercedes]

My 1982 Astra with the 1.8L OHC engine had a non-interference engine. When the belt slipped off the crank pulley, it was just a matter of stopping at the side of the road and sliding it back into place... but now we have progress so a snapped belt means damaged valves and pistons, and on a 5-years old car can mean the scrapyard...

Usually it's the rockers that get smashed, the valves and pistons tend to survive, meaning that a snapped belt is not the end of the world.