London and parts of Essex and Hertfordshire will move into the highest level of coronavirus restrictions from one minute past midnight on Wednesday, MPs have been told.
The move will see thousands of bars, pubs, cafes and restaurants close in the capital and surrounding areas after Tuesday night, except for takeaway, delivery and click and collect services.
Under Tier 3 measures, people must not meet socially indoors, in private gardens, or at most outdoors public venues with anyone they do not live with or are not in a support bubble with.
The heightened restrictions also mean fans will likely once again be banned from football stadiums and other sporting venues.
And theatres are also set to have to close their doors once more.
However, the "rule of six" will allow people from different households to continue meeting in small groups outdoors in parks, public gardens, playgrounds or outdoor sports facilities.