Christmas Eve in the United Kingdom

Christmas Eve is the Day before Christmas Day, which is annually on December 24, according to the Gregorian calendar. It is not a public holiday in the United Kingdom but it is a day of preparations for the Christmas season. The Christmas season includes the public holidays on Christmas Day, Boxing Day, New Year’s Day and January 2 (Scotland only).

https://www.timeanddate.com/holidays/uk/christmas-eve