Leah&john, you were probably quoted a price including the belt and the TENSIONER... The tensioner is aroud the £40 mark,although it is often not neccessary to replace this part unless its faulty.
You can tell if its up to the job by sight and feel.
I'd say £100 for a cambelt change (they supply) with no tensioner, is about the most you would be likely to pay...(unless its a mazda main dealer)
