New Covid restrictions have come into force in Scotland, Wales and Northern Ireland as the nations try to halt the surge in infections. All three nations have introduced curbs on the hospitality and leisure industry, resumed social distancing rules and put limits on the size of gatherings.
Boris Johnson has not announced any further restrictions in England. But the Prime Minister said he would not hesitate to act if necessary.
Daily coronavirus figures are not being reported over Christmas Day and Boxing Day, but Friday saw a new high of 122,186 U.K. cases.
The Office for National Statistics estimated – using its weekly random testing programme – that 1.74 million people, or one in 35, had coronavirus seven days ago. But that was before last week's big increase in the daily counts, which are based on positive results in tests.
Each of the three nations that has reimposed restrictions has chosen different rules, but they all feature limits on the size of gatherings, requirements for social distancing and tighter rules for pubs, restaurants and leisure venues.
Starting on Boxing Day in Scotland:
* Indoor events will be limited to 100 people standing or 200 people sitting, while outdoor events will be capped at 500 people
* One metre physical distancing will be required at public events
And from Dec 27:
* Pubs, restaurants, theatres, cinemas and gyms will have to ensure a one metre distance between groups of people
* Groups of people meeting will be limited to three households
* Table service will be required in hospitality venues offering alcohol
The new restrictions in Wales from Boxing Day mean that:
* No more than six people can meet at pubs, cinemas and restaurants
* Outdoor events are limited to 50 people, and there is a maximum capacity of 30 for indoor events, including in private homes
* Two-metre social distancing is required in offices and public places
* Nightclubs have to close
And from Boxing Day in Northern Ireland, nightclubs must remain closed and indoor standing events are banned. Then, from 06:00 on Dec 27, pubs, cafes and restaurants will have to provide table service only, while no more than six people from different households will be allowed to sit together.
The new rules mean that Boxing Day football matches in Scotland's premiership will be played in front of a maximum of 500 seated fans, while in Wales all large sporting events will be played behind closed doors.
In England, Covid cases have hit the popular Boxing Day football line-up, forcing the postponement of Premiership games between Burnley and Everton, Liverpool and Leeds United and Wolverhampton Wanderers against Watford.