Over the last couple of weeks my wife, who has a prestigious German car, has been contacted twice by our local dealer. He advised that because the car was five years old they were obliged by Health & Safety rules to recommend that the tyres should be changed, not because of wear but because of age. I have never heard of such a thing. Is this true or is it a rather slippery marketing ploy. Needless to say we ignored their advice, but an elderly vulnerable driver could easily have been taken in.