Boris Johnson called senior ministers to an unscheduled meeting on Friday evening to discuss how to contain a new, more virulent variant of the coronavirus.
An emergency toughening of Covid-19 restrictions could be announced as soon as Saturday, possibly including restrictions on travel between the south-east of England, including London, and the rest of the country, The Daily Telegraph reported.
A spokesman for the prime minister said he was unable to comment on the report immediately.
Britain's government on Monday said a rise in new infections might be partly linked to the new variant as the capital and other areas have moved into the highest tier of Covid-19 restrictions.
Meanwhile, a severe variant of the coronavirus has been detected in South Africa, which could explain the rapid spread of a second wave that is affecting younger people, South African Minister of Health Zwelini Mkhize said Friday.
Known as the 501.V2 Variant, it was identified by South African researchers and details have been sent to the World Health Organisation, Dr Mkhize said in a statement.
A team led by the KwaZulu-Natal Research Innovation and Sequencing Platform (KRISP) has sequenced hundreds of virus samples since the pandemic began and "noticed that a particular variant has increasingly dominated the findings of the samples collected in the past two months," he added.
South African doctors have remarked that more patients are younger and do not always have other conditions that amplify the virus's effect, but they nonetheless suffer from more severe forms of Covid-19.

That "strongly suggests that the current second wave we are experiencing is being driven by this new variant," Dr Mkhize concluded.
The research team, led by Tulio de Oliveira, has shared its findings with the scientific community and alerted authorities in Britain, who have "studied their own samples and found that a similar mutation ... was the variant that was driving their resurgence in London," he said.
RESULTS
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Starring: Ramy Youssef, Steve Carell, Jason Schwartzman
Director: Jesse Armstrong
Rating: 3.5/5
Brief scores:
Toss: Northern Warriors, elected to field first
Bengal Tigers 130-1 (10 ov)
Roy 60 not out, Rutherford 47 not out
Northern Warriors 94-7 (10 ov)
Simmons 44; Yamin 4-4
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Bournemouth 1 Manchester City 2
Watford 0 Brighton and Hove Albion 0
Newcastle United 3 West Ham United 0
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Manchester United 2 Leicester City 0
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Dubai launched the pilot phase of its real estate tokenisation project last month.
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What should do investors do now?
What does the S&P 500's new all-time high mean for the average investor?
Should I be euphoric?
No. It's fine to be pleased about hearty returns on your investments. But it's not a good idea to tie your emotions closely to the ups and downs of the stock market. You'll get tired fast. This market moment comes on the heels of last year's nosedive. And it's not the first or last time the stock market will make a dramatic move.
So what happened?
It's more about what happened last year. Many of the concerns that triggered that plunge towards the end of last have largely been quelled. The US and China are slowly moving toward a trade agreement. The Federal Reserve has indicated it likely will not raise rates at all in 2019 after seven recent increases. And those changes, along with some strong earnings reports and broader healthy economic indicators, have fueled some optimism in stock markets.
"The panic in the fourth quarter was based mostly on fears," says Brent Schutte, chief investment strategist for Northwestern Mutual Wealth Management Company. "The fundamentals have mostly held up, while the fears have gone away and the fears were based mostly on emotion."
Should I buy? Should I sell?
Maybe. It depends on what your long-term investment plan is. The best advice is usually the same no matter the day — determine your financial goals, make a plan to reach them and stick to it.
"I would encourage (investors) not to overreact to highs, just as I would encourage them not to overreact to the lows of December," Mr Schutte says.
All the same, there are some situations in which you should consider taking action. If you think you can't live through another low like last year, the time to get out is now. If the balance of assets in your portfolio is out of whack thanks to the rise of the stock market, make adjustments. And if you need your money in the next five to 10 years, it shouldn't be in stocks anyhow. But for most people, it's also a good time to just leave things be.
Resist the urge to abandon the diversification of your portfolio, Mr Schutte cautions. It may be tempting to shed other investments that aren't performing as well, such as some international stocks, but diversification is designed to help steady your performance over time.
Will the rally last?
No one knows for sure. But David Bailin, chief investment officer at Citi Private Bank, expects the US market could move up 5 per cent to 7 per cent more over the next nine to 12 months, provided the Fed doesn't raise rates and earnings growth exceeds current expectations. We are in a late cycle market, a period when US equities have historically done very well, but volatility also rises, he says.
"This phase can last six months to several years, but it's important clients remain invested and not try to prematurely position for a contraction of the market," Mr Bailin says. "Doing so would risk missing out on important portfolio returns."
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Results
United States beat UAE by three wickets
United States beat Scotland by 35 runs
UAE v Scotland – no result
United States beat UAE by 98 runs
Scotland beat United States by four wickets
Fixtures
Sunday, 10am, ICC Academy, Dubai - UAE v Scotland
Admission is free
Key fixtures from January 5-7
Watford v Bristol City
Liverpool v Everton
Brighton v Crystal Palace
Bournemouth v AFC Fylde or Wigan
Coventry v Stoke City
Nottingham Forest v Arsenal
Manchester United v Derby
Forest Green or Exeter v West Brom
Tottenham v AFC Wimbledon
Fleetwood or Hereford v Leicester City
Manchester City v Burnley
Shrewsbury v West Ham United
Wolves v Swansea City
Newcastle United v Luton Town
Fulham v Southampton
Norwich City v Chelsea
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The biog
Profession: Senior sports presenter and producer
Marital status: Single
Favourite book: Al Nabi by Jibran Khalil Jibran
Favourite food: Italian and Lebanese food
Favourite football player: Cristiano Ronaldo
Languages: Arabic, French, English, Portuguese and some Spanish
Website: www.liliane-tannoury.com