My next door neighbour recieved a warning from the police this morning for leaving his car idling in his driveway. He had started the car and gone back into the house to let the car warm up. A passing police car spotted the car and chapped his door. The said it is an offence to leave a car idling.

What are the rules on this.?

Am I aloud to start my car on a cold morning to let it heat up and windows clear as long as i'm in the car?

Or is that still an offence?

Sometime you have to let the inside warm up to make it safe to drive, even if you scrape the outside!