Remote villages in Lincolnshire are "totally cut" off under two feet of snow, emergency services have said.
Lincolnshire Police warned that "most roads" in the county had become impassable and urged people not to make journeys "unless absolutely necessary".
Officers said the A52 had become impassable between Boston and Skegness and that they would not be able to reach stranded drivers.
Not even a snowplough was able to get through, the fire service said.
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Two separate South Western Railway trains broke down - and passengers were left with no water, food or heating for more than 12 hours.
A red "danger to life" weather warning has been issued in the south west and Wales as the region braces for up to 50cm of snow.
A man has died after being pulled from a lake in south east London.