Leave Is It Illegal To Leave Your Keys In A Running Car?

Is it illegal to leave your keys in a running car? - leave

Is it forbidden to leave the keys in a car race, even if it is locked and in your driveway? In the winter I just want to warm up and the windows while I was always ready to thaw for the work can be completed. I know it is illegal and motor insurance cover adapted stolen if you leave the keys in the ignition and abandoned. But if I am the door are still covered for theft?