Hi all. I have vectra c sxi dti 2.2 03 plate. Bought it a couple of weeks ago. The service is due so went to my local garage and the man said I was due for a cam change. I was sure this car had a cam chain and this wouldn't need changing as has shown no issues since I had it. But I'm not that mechanically minded and don't want to pay 350 quid for something that I don't need or may not even exist? Anyone can help me please?