What's the best method for fixing a minor scratch?

My wife had her Volkswagen Polo scratched in a car park recently and the perpetrator left a note. I am keen to keep the cost down in view of his honesty and avoid involving my insurer. I am considering...

Repairing with 'pens'

Do you have a view regarding advertised magic 'pens' that purport to remove scratches and road chipping marks whatever the colour or type of paint your car has, or are these pens only any use for very...