Parts of the country are waking up to more than four inches of snow, prompting fears of ice and disruption during rush hour.
Most areas from Scotland down through to south-east England have been hit with a covering of at least two inches of snow and the worst affected areas, including north England and the Midlands, could have twice that.
More than four inches has already settled in High Wycombe according to reports, weather experts said.
Nick Prebble, a forecaster for MeteoGroup, the weather division of the Press Association, said: "There has been quite a lot of snow overnight, the worst affected areas are northern England down through to the Midlands and towards the south-east, and of course Scotland.
"Everywhere will see a covering, with most places seeing between one and two inches, but it won't be surprise if some areas get more than four inches. There are reports of nearly four and a half inches in High Wycombe, and even up to an inch in London.