In tier 4 areas, which included London[1], no mixing was allowed over the Christmas period, including Christmas day. Source: Being in London during Christmas.

In tier 4 areas, which included London[1], no mixing was allowed over the Christmas period, including Christmas day. Source: Being in London during Christmas. [1] https://www.bbc.co.uk/news/uk-england-london-55380644 https://www.bbc.co.uk/news/uk-england-london-55380644