The weather forums are going into meltdown about what the various forecast models are showing for the coming week. It may not come to pass - there is potential for large amounts of snow for the end of the week but that is not yet in anything like a reliable timeframe and it could all change in the next few days if, say, warm air pushes up from the south and it turns to rain.
What I can say is that at face value, they are showing some fairly extreme weather. All triggered, it seems, by a record-breaking Sudden Stratospheric Warming a couple of weeks or so ago. Whether it snows or not, it does look like being a lot colder than the BBC figures suggest. The coldest air doesn't start arriving until Monday.