GEM Motoring Assist is urging motorists not to leave their cars unattended with the engine running to warm up and clear misted-up or frozen windows.

Not only do frosty mornings offer easy pickings for thieves on the look-out for unattended cars, but it's also an offence to leave an unattended vehicle with the engine running on a public road.

GEM chief executive David Williams said: 'Opportunist thieves are sure to be out and about because they're more likely to come across unlocked cars with keys in the ignition, all ready to go.

'While it may be tempting to leave the engines running and let the car warm up before driving off, the action represents an open invitation for a thief looking for an easy prize. After all, thieves can be into the car and away while your back is turned for just a few seconds. To add insult to injury, you may well find that your insurance policy will be invalidated if your car is stolen in this way.'

GEM's advice is to stay with your vehicle when you are defrosting it on a chilly morning, whether on the public road or your own drive. If you need to leave it unattended, then remove the keys from the ignition and lock it.