London could see temperatures of about 14C today.
More people may also choose to travel on the roads as thousands of members of the Rail, Maritime and Transport union strike from 18:00 on Christmas Eve.
RAC spokesman Rod Dennis said: "If possible, drivers should try to make their trips on a quieter day earlier this week if they possibly can." "The last thing we want is for people to experience further disruption as temperatures rise... putting many homes at risk of burst pipes due to freeze-thaw."as sub zero temperatures tuned to rapid thaw, with an extra 100 million litres of water a day passing through them.
But BBC Weather said on Sunday that the bitterly cold, frosty weather was turning "to something much milder, wetter and windier".
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