Londoners were today issued with an ice warning as snow hardens in the capital and around the south east.
More than 100 people sought shelter at the Jamaica Inn on Bodmin Moor after scores of vehicles were stranded the A30.
Snowfall and icy conditions are expected to cause widespread travel disruption in many parts of the United Kingdom after temperatures plummeted as low as minus 15.4C overnight.
An "intensive effort" is underway to help the motorists according to Chief Inspector Adrian Leisk, head of roads policing across Devon, Cornwall and Dorset.
Yellow warning from the Met Office for Scotland early Monday.
A fresh weather warning is due to take effect on Monday.
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Tonight will become "Increasingly cloudy overnight, with coastal wintry showers becoming more frequent and spreading further inland as a northeast breeze picks up", add the Met Office.
The lowest ever temperature in the United Kingdom in January was also recorded in Braemar when temperatures plummeted to minus 27.2C (-16.96F) in 1982.
From about 7pm there is a chance of light snow across the county but the Met Office has warned by 8pm there is a 90 per cent chance of "heavy snow" which could continue to fall for the next few hours.
Snow was also seen falling at Heathrow on Friday, where British Airways altered a number of short-haul flights on Thursday, and passengers using the hub were being told to stay in contact with their airlines before travelling.
Snow fell in the city last night but melted by the time morning arrived.
"Saturday night into Sunday could also be very cold", Mr Wilson said.