dodgy left leg unfortunately

You mention buy as new a car as possible, so does that mean there are significant differences between say the S and X reg's

Also, another question, does the 1.6 auto have enough pull (i know the mk4 is a heavy car), has anyone driven one before ??
what about mileage, fo £5000 should i be looking at under 40,000 , how long will they go on for ??