What is the penalty for leaving your car with its engine running?
If you are caught by police while using this method, you will be given a fixed £20 fine – or £40 if not paid within a certain time frame.
But never mind the police, leaving the engine going to warm it up or defrost your windscreen while you pop back inside makes your vehicle the ideal target for opportunistic thieves.
Should your car be stolen in this way, it is more than likely your insurance company will refuse to pay out on your loss, as you have invalidated your insurance by acting in a way which significantly increased the risk of your car being stolen.
Instead, try other ways of defrosting your windscreen, such as poring a solution of water with a teaspoon of salt over any icy areas.