Andy,
Modern car paint's will 'except' all manner of waxing, cutting and polishing (and that includes using fine wet and dry sand paper and orbital polishers!).
As I worked in the Automotive Accident Repair Industry for a number of years, you will be 100% OK to use a modern polish like: Autogylm - that has a light cutting compound to it. However, I would always apply a Wax afterwards.
Mark
