I purchased a used 2010 Volkswagen Golf last month, which is still covered by its dealer warranty. I have had it inspected by a local garage after it started making noises when the ignition was switched on and they have advised that there may be an issue with the timing belt and suggest that I have it changed before it damages the engine.

I have checked the warranty small print and the timing belt is covered if it fails. Should I make them aware of the potential problem? Also, does my car have a timing chain or belt?