Gutted! Problem after Problem :(

I'd of said the cam chain rattle is more likely a result of low oil pressure and not cause it.
Time wise I'd of said around 3-4 hours.

Yes well the pick u pipe caused the previous pressure problem so maybe so.

If it is the chain, what damage can it cause? if any?

And thanks for the replys :)
 
If the chain broke then valve to piston contact as the chain drives the other cam.
Whether you'd only need the tensioner I don't know but if your in there do chain and tensioner.
 
Ok so picked my car up, the guy said oil pressure is fine its just something causing it to change, drove home with no light coming on.

but i will just hope