I recently had my cambelt go on me while I was driving. Having only done 60k on the clock, and going by the manual I didn't think of changing the belt until the book said. How wrong of me! Cost almost £1400 to put the damage right. Anyway, from my experience and having spoke with both an Alfa dealer garage and an Alfa independent garage I'd advise you to find yourself a good independent. Not only do they know what they are doing (as most Alfa garage mechanics aren't Alfa specialists but just mechanics who happen to work in the garage when Alfa took over the franchise) and they are a lot cheaper, and if you find a good one, a lot more bloody honest too! Alfa dealership suggest that it will cost £400+ for a cambelt change, whereas most independents will do it for a shade over £300. A ton in your pocket beats having a main dealer stamp in the book seeing as the Alfa "goodwill" doesn't really exist despite having a main dealer service history.