Most importantly, have a mobile phone well charged and a car charger to hand.
It’s a good idea to keep a blanket, some de-icer, a map and something to eat and drink in the car, plus the vehicle should always have a warning triangle if the worst should happen.
Driving in the snow
Most obviously, it’s important to slow right down when driving in very cold weather.
It will be much harder to stop on a snow covered or frozen road, with experts recommending leaving as much as 10 times the normal gap to the next car.