This weekend is not looking good - but the main hazard is not the snow (although there could be quite a lot in some areas), it's actually ice.
What's essentially happening is that a cold front has come down across the UK bringing rain (which passed us here in Exeter an hour or so ago) and then bitterly cold air is following behind. What this means is that all the rain that is falling today will turn to ice overnight (possibly black/sheet ice), because the ground is so cold already, which could cause major problems on the roads tomorrow.
We just had our first forecasting exams yesterday and today and we already have a contingency plan in place to get our results tomorrow in case the weather is too bad and we can't get to work in the morning!