Millions of residents within London will enter Tier 2 Covid-19 restrictions from this Saturday, meaning mixing with other households indoors will be banned.
It comes as 12 boroughs hit the threshold of over 100 daily cases per 100,000 people in the week to October 8 and cases across the nation continues to rise again.
Essex is also expected to move up to the Tier 2 restrictions this weekend too.
Under Tier 2, households are also barred from mixing in pubs and restaurants and people should aim to avoid public transport.
However, people can meet up in beer gardens and private gardens, where the national rule of six applies.
Schools, universities and places of worship are allowed to remain open, as well as offices and business venues.
Ministers have been briefed over the new measures in a call with health minister Helen Whately.
Health Secretary Matt Hancock is due to update MPs on the latest measures in a Commons statement later today.
Cases per 100,000 people across some London boroughs are:
Richmond Upon Thames (140.4)
Hackney and city of London (133.1)
Kensington and Chelsea (103.8)
Hammersmith and Fulham (101.5)
Kingston Upon Thames (101.4)
Tower Hamlets (100.4)
All new measures introduced will be reviewed by the Government every four weeks.