Can you clarify if the 1.2 petrol Corsa (2006 model) is cam belt or chain? I am advised by my local Vauxhall garage that the cam belt and water pump needs changing at 10 years or 100,000 miles at a cost of £360. Checking your site seems to suggest that it does not have a cam belt but a chain which only needs replacing if rattling badly. Which is it?