The UK has reported another 55,892 daily cases of coronavirus, setting a new record.
And another 964 people died within 28 days of a positive test, only slightly down on the 981 on Wednesday.
Hospitals in London, Essex and Buckinghamshire are reporting that they are under extreme pressure because of increasing numbers of Covid patients.
It comes as 20 million more people in England are placed under the toughest restrictions and told to stay at home.
The new restrictions mean 44 million people, or 78% of the population of England, are now in tier four, where non-essential shops, gyms, cinemas and hairdressers have to stay shut.
Public Health England medical director Dr Yvonne Doyle said Christmas week had seen a worrying rise in cases particularly among adults in their 20s and 30s, adding "we must not now add further fuel on the fire" by meeting in groups for New Year's Eve.
"We have all had to make huge sacrifices this year, but please ensure that you keep your distance from others, wash your hands and wear a mask," she said.
"A night in at new year will mean you are significantly reducing your social contacts and can help stop the spread of the virus."
The 981 deaths recorded on Wednesday was the highest daily figure since April.
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Covid-19: UK reports a record 55,892 daily cases - BBC News