New lockdown restrictions for England are the latest measures brought in for the UK.
Different rules are now in place in each of the four nations.
This is the picture in England, Wales, Scotland and Northern Ireland.
On Saturday, Prime Minister Boris Johnson announced new measures for the whole of England which are to come into force from Thursday.
Pubs, bars, restaurants and non-essential retail will close until December 2 and people will be told to stay at home unless they have a specific reason to leave, but schools, colleges and nurseries will remain open.
People will be allowed outside to exercise and socialise in public spaces outside with their household or one other person, but not indoors or in private gardens, and will be able to travel to work if they cannot work from home.
The whole of Wales is currently under a 17-day “firebreak” lockdown which started on October 23 and will last until November 9.
People can only leave their homes for limited reasons and must work from home where possible. Leisure, hospitality and tourism businesses are closed, along with community centres, libraries and recycling centres. Places of worship are shut other than for funerals or wedding ceremonies.
The majority of Scots will be placed into Level 3 of a new five-tier system from Monday, with the rest of the country in either Levels 1 or 2.
The central belt – including Edinburgh, Glasgow, Stirling and Falkirk – will be joined by Dundee and Ayrshire in Level 3.
Aberdeenshire, Aberdeen, Fife, the Borders, Dumfries and Galloway, Argyll and Bute, Perth and Kinross and Angus will be in Level 2.
Highland, Moray, Western Isles, Orkney and Shetland have been assessed as Level 1.
Levels 1, 2 and 3 are broadly comparable to tier system currently in place in England.
Despite ministers considering putting North and South Lanarkshire into Level 4 – equivalent to a full lockdown – First Minister Nicola Sturgeon said on Thursday no area will be placed into that highest tier at the moment.
She has told Scots not to travel to England unless it is for “essential purposes”.
– Northern Ireland
Pubs and restaurants were closed for four weeks starting on October 16 with the exception of takeaways and deliveries. Schools were closed for two weeks.
Retail outlets remain open, along with gyms for individual training.
People have been told they should work from home unless unable to do so, and have been urged not to take unnecessary journeys.