Numerous yellow weather warnings for snow and ice have been issued in each of the four nations.
Yellow warnings for snow and ice covering Wales, the Midlands and south-west England and parts of the Midlands came into force on Sunday evening at 20:00 and are due to run until 11:00 on Monday.
Ahead of the Monday rush hour, the Met Office has highlighted the risk of longer journey times by road and rail on Monday and Tuesday morning, as well as the potential for slips and falls on pavements and cycle routes.
Parts of Scotland have a yellow snow and ice warning in place until the end of Tuesday.
There is a potential for another 5 to 10cm of snow at low levels, and 20 to 30cm on high ground for much of the Highlands and Aberdeenshire areas, Orkney, Shetland, and Outer Hebridean Islands, PA media reports.
