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 have a work Christmas lunch or party, where that is a primarily social activity and is not otherwise permitted by the rules in your tier."

16 December 2020: London is moved to Tier 3. Indoor gatherings of two or more persons from different households continue to be prohibited. Social distancing remains the rule at work, with offices advised "to maintain social distancing guidelines (2m, or 1m with risk mitigation where 2m is not viable), wherever possible, including while arriving at and departing from work, while in work and when travelling between sites".

20 December 2020: London is moved to a newly-created Tier 4 with much of South East England, to help control the Alpha variant. The "stay at home restrictions" prohibit leaving one's home except for permitted purposes

6 January 2021: All areas of England are moved into Tier 4's stay at home restrictions. This is the third national lockdown. The stay at home restrictions prohibit leaving one's home except for permitted exceptions which include where it is "reasonably necessary... for the purposes of work" and where it is not reasonably possible to work from home

29 March 2021: All areas of England move to Step 1 and the "stay at home restrictions" are lifted. Gatherings of two or more persons indoors or more than six persons outdoors are prohibited, subject to exceptions which include where a gathering is "reasonably necessary for work purposes"

12 April 2021: All of England moves to Step 2. Non essential retail businesses and many outdoor venues reopen but the restrictions on social mixing indoors and outdoors do not change

17 May 2021: All of England moves to Step 3, permitting six persons or two households to mix indoors and up to 30 people to mix outdoors 11