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British Prime Minister Boris Johnson is to chair a meeting of the government's emergency committee later Monday after France closed its borders to arrivals from the U.K. to stem the spread of a new strain of the coronavirus circulating in London and the southeast of England.

The meeting of the COBRA civil contingencies committee comes amid warnings of "significant disruption" around the ports in the English Channel, with tailbacks going back miles into Kent, the county in southeastern England.

The tailbacks came after France announced Sunday that it was closing its borders for 48 hours, which means lorries cannot get across the English Channel by boat. Goods arriving on containers are unaffected.

EUROPEAN NATIONS BAN FLIGHTS FROM UK TO PREVENT CORONAVIRUS MUTATION FROM SPREADING TO CONTINENT

The government has urged everyone to avoid traveling to Kent, which hosts many of the cross-Channel ports. Dover notably sees around 10,000 lorries pass through every day, accounting for around 20% of the U.K.'s trade in goods. Eurotunnel, the rail service that links Britain with mainland Europe, has also suspended services.

People at St. Pancras station in London, wait to board the last train to Paris on Sunday, Dec. 20, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. British Prime Minister Boris Johnson said Saturday that holiday gatherings can’t go ahead and nonessential shops must close in London and much of southern England. (Stefan Rousseau/PA via AP)

People at St. Pancras station in London, wait to board the last train to Paris on Sunday, Dec. 20, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. British Prime Minister Boris Johnson said Saturday that holiday gatherings can’t go ahead and nonessential shops must close in London and much of southern England. (Stefan Rousseau/PA via AP)

Canada, India and Poland are among the latest countries to halt flights from the U.K., following the lead of many in Europe. France, Germany, Italy, the Netherlands, Belgium, Poland, Austria, Denmark, Ireland and Bulgaria were among those who on Sunday announced widespread restrictions on flights from the U.K.

The moves come in the wake of Johnson's announcement on Saturday that he was placing London and the southeast of England in a new Tier 4 level of restrictions after a warning from its scientific advisers — using what is widely considered to be one of the world's most sophisticated genome sequencing regimes — that the new variant was spreading far faster than existing strains.

In Brussels, experts from member countries were meeting to discuss the new variant on Monday.

Johnson said early indications are that the new variant of the virus is 70% more transmissible and is driving the rapid spread of new infections in the capital and surrounding areas. On Sunday, the U.K. recorded a record daily total of 35,928 new infections.

The European Centre for Disease Prevention and Control said in a "threat assessment" Monday that while preliminary analysis in the U.K. suggests the new variant is "significantly more transmissible," there is no indication that infections are more severe.

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The Stockholm-based agency said a few cases with the new variant have been reported already by Iceland, Denmark and the Netherlands. It also cited media reports of cases in Belgium and Italy.

Britain's Prime Minister Boris Johnson speaks during a news conference in response to the ongoing situation with the coronavirus (COVID-19) pandemic, inside 10 Downing Street, London, Saturday, Dec. 19, 2020. Johnson says Christmas gatherings can’t go ahead and nonessential shops must close in London and much of southern England as he imposed a new, higher level of coronavirus restrictions to curb rapidly spreading infections. (Toby Melville/Pool Photo via AP)

Britain's Prime Minister Boris Johnson speaks during a news conference in response to the ongoing situation with the coronavirus (COVID-19) pandemic, inside 10 Downing Street, London, Saturday, Dec. 19, 2020. Johnson says Christmas gatherings can’t go ahead and nonessential shops must close in London and much of southern England as he imposed a new, higher level of coronavirus restrictions to curb rapidly spreading infections. (Toby Melville/Pool Photo via AP)

While experts are stressing that there is no evidence that the new strain is any more lethal, it's inevitable that more cases will lead to more hospitalizations and subsequent virus-related deaths.

British Transport Secretary Grant Shapps said France’s ban on freight hauliers was "slightly surprising" and that he is putting contingency plans for Kent in place, including the opening up of a lorry park and providing "welfare" for some of those drivers stuck there.

"The Kent Dover-to-Calais Eurotunnel, what we call the short straits, is probably about 20% of goods going to and from, in and out of the country," he told Sky News. "But it’s not the mainstay. Most goods actually come in and out by unaccompanied containers and those will continue to flow."

Shapps insisted that the public won't notice any shortages "for the most part" as a result of the ban on lorries and that the supply of coronavirus vaccines will continue as they come via containers that are unaffected.

A cyclist passes Oxford Circus after Britian's Prime Minister Boris Johnson introduced Tier 4 restrictions for London and the southeast of the country, in London, Sunday, Dec. 20, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. (Stefan Rousseau/PA via AP)

A cyclist passes Oxford Circus after Britian's Prime Minister Boris Johnson introduced Tier 4 restrictions for London and the southeast of the country, in London, Sunday, Dec. 20, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. (Stefan Rousseau/PA via AP)

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All this economic disruption comes at a time of huge uncertainty for the U.K., less than two weeks before it leaves the EU’s tariff-free single market and customs union on Dec. 31.

Though the U.K. left the bloc on Jan. 31, it is in a transition period that effectively sees it abide by EU rules until the end of this year. Talks on a post-Brexit trade relationship are still deadlocked and are set to resume on Monday.

Retailers played down fears of food shortages in the short term at least, but warned that there could be problems if the travel bans last for a while and if the U.K. and the European Union fail to agree a post-Brexit trade deal.

The British Retail Consortium warned that the closure of France-to-U.K. traffic would create trading "difficulties" in the busy Christmas period.

People walk across the Millennium Bridge in London, Monday, Dec. 21, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. (Dominic Lipinski/PA via AP)

People walk across the Millennium Bridge in London, Monday, Dec. 21, 2020. Millions of people in England have learned they must cancel their Christmas get-togethers and holiday shopping trips. (Dominic Lipinski/PA via AP)

"Retailers have stocked up on goods ahead of Christmas which should prevent immediate problems," said Andrew Opie, director of Food & Sustainability at the British Retail Consortium.

"However, any prolonged closure of the French border would be a problem as the UK enters the final weeks before the transition ends."

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Trade association Logistics U.K. has urged people to stay calm and not to rush to supermarkets to stockpile goods.

"Shoppers should not panic buy," said Alex Veitch, general manager at Logistics U.K. "Retailers will be making every effort to ensure there is stock within the system, including fresh produce, and it is important that we remember that inbound traffic still has access to the U.K."