The cold snap, which was originally projected to run until Monday 6, is set to continue this week, with Thursday set to see the lowest temperatures of the winter so far.
The Met Office said temperatures could drop to -15°C, with lying snow in Scotland or northern England.
Fronts moving in from the southwest on Friday and Saturday bring the potential for even more snow, with the possibility of further warnings.
The cold weather can seriously affect drivers, who might be exposed...