Hi Ian, I've bought the cam belt kit from carparts4less. You give your car reg and they supply the correct product for your car, which is only one belt and an idler. I've had the cover off the timing belt, so I can say with some certainty that my 1.8 durotorq diesel engine has the one belt. It may well have a chain elsewhere, but my understanding is that this seldom needs changing unless the car has a particularly high mileage. The 1.6 is a different beast altogether, and looking at the Haynes manual, it seems far more difficult to deal with.
Barrymx5 From some research I think that what is mentioned above by iantt is correct about the 1.8 having 2 belts. (Timing Belt + Chain). Crankshaft and diesel injection pump are connected by a chain an then the diesel injection pump is connected to the camshaft by a timing belt.