The gov.uk website states that from 2 December, everybody must follow this guidance for the tier in your area.
The guidance covers:
In relation to visiting bars, pubs and restaurants, the guidance states:
“From 2 December, the rules on who you can meet with in bars, pubs and restaurants will depend on your tier. The rules might be different for indoor and outdoor hospitality settings. Check the rules for your tier.
“Between 23 and 27 December, the rules on who you can meet in bars, pubs and restaurants will not change.”