Latest info I could find
https://www.gov.uk/government/publications/coronavirus-outbreak-faqs-what-you-can-and-cant-do/coronavirus-outbreak-faqs-what-you-can-and-cant-do
It remains the case that you should not:
socialise indoors in groups of more than two households (anyone in your support bubble counts as one household) – this includes when dining out or going to the pub
socialise outdoors in a group of more than six people from different households; gatherings larger than six should only take place if everyone is from exclusively from two households or support bubbles
interact socially with anyone outside the group you are attending a place with, even if you see other people you know, for example, in a restaurant, community centre or place of worship