Residents in Tier 4 areas must stay at home, with limited exemptions. Non-essential retail and indoors gyms will close.
People should work from home when they can and should not enter or leave Tier 4 areas. Communal worship may continue.
Residents should not mix with anyone outside their own household at Christmas, though support bubbles will remain in place for those at particular risk of loneliness or isolation.
The restrictions will last for two weeks and will be reviewed on 30 December.
What you can and cannot do in areas with a very rapidly rising level of infections - including the London Borough of Bexley - where tighter restrictions will be in place from 20 December.