Flights from the UK are being suspended to countries across the world including Spain, India and Hong Kong.

France shut its border with the UK for 48 hours, meaning no lorries or ferries can leave from the port of Dover.

Boris Johnson said he spoke with French President Emmanuel Macron and both sides wanted to resolve "these problems as fast as possible".

The prime minister told a Downing Street press conference: "We had a very good call and we both understand each other's positions."

Mr Johnson, who earlier chaired a meeting of the government's emergency committee, added: "We are working with our friends across the Channel to unblock the flow of trade."

And French Europe Minister Clément Beaune said they would announce on Tuesday what measures were being introduced "after this phase of emergency and harsh precaution that we had to take". He said they would come into effect from Wednesday.

European Union member states met earlier in Brussels to discuss a co-ordinated response, with officials suggesting a requirement for tests could be imposed on all people arriving from the UK.
It came as the Northern Ireland Executive met on Monday night to consider whether to impose a travel ban between NI and England, Scotland and Wales.

Countries to impose a ban on UK arrivals include Belgium, Canada, Germany, Ireland, Italy, Portugal, Romania, Russia, and Switzerland.

Some of the bans are already in force while others are to begin on Tuesday.

Eurotunnel services to France are also suspended and Eurostar trains to Belgium are not operating.

However, Eurotunnel spokesman John Keefe said he hoped travel from the UK could begin on Wednesday or Thursday.

Meanwhile, Royal Mail says it has temporarily suspended all mail services to Europe, with the exception of the Republic of Ireland, due to the "current restrictions around air, road, ferry and train movements from the UK".

The latest figures released on Monday reveal that another 33,364 people in the UK have tested positive for coronavirus.

There were also a further 215 deaths within 28 days of testing positive, bringing the nation's total to 67,616.

Health Secretary Matt Hancock has warned that the new variant of the virus - which may be up to 70% more transmissible - is "getting out of control".

The new variant has spread quickly in London and south-east England, but health officials say there is no evidence that it is more deadly or would react differently to vaccines.

Labour leader Sir Keir Starmer described the situation as a "real emergency", saying: "The news over the last 24 hours has been deeply disturbing. The number of coronavirus cases has nearly doubled in the last week.

"We can have no more over-promising and false hope, confused messages and slow decision-making. We need strong, clear and decisive leadership."

Scotland's First Minister Nicola Sturgeon said the government had plans for coping with port disruption in the event of a no-deal Brexit and should now activate the measures.

Analysis by Simon Jones, BBC correspondent, at the port of Dover

As the day has gone it, it seems the frustration of some hauliers has grown.

Many have been sounding their horns - after being refused entry to the Port of Dover. A few have been brandishing paperwork at the officials keeping them out.

The reality is, whatever documentation they may have, they aren't being allowed to leave the UK today.

The only journey they're being told to make is to the back of the ever-growing queue that makes up Operation Stack.

That will mean spending tonight, and all day tomorrow in their cabs - when all they want to do is get back home.

It's a depressing situation in the run-up to Christmas. And if France does insist that all drivers need to be tested before being allowed to cross the Channel, it's likely some won't make it back before the big day.

The coast-bound carriageway of the M20 motorway has been shut between Junctions 7 and 12 and Junction 9 and 8 London-bound, according to Highways England.

It said all European freight destined for Dover Port and Eurotunnel Terminals "will be no longer stacked on the M20 coastbound between junctions 8 and 12 and is being directed to Manston Airfield".

Manston had been readied to take up to 4,000 lorries.

On Monday morning, Mr Shapps said the situation in Kent was "not too disrupted" saying "it's mostly European and French hauliers getting caught up in this" and that about 20% of the overall 32,000 units of freight shipped today were affected by the restrictions.

Mr Shapps told BBC Breakfast that Covid-19 vaccine supplies - which come from Belgium - would not be affected by travel bans, as they come to the UK via unaccompanied containers.

Unaccompanied freight, such as containers or lorry trailers on their own, can still be transported.

Iain Wright, chief executive of the Food and Drink Federation, told BBC Breakfast there was "no need" for shoppers to panic-buy as a result of the border restrictions.

But he added there was "concern" around food supplies in the longer term, particularly after Christmas.

About 10,000 lorries travel between Dover and Calais every day during peak periods such as Christmas.

But Downing Street has urged people to "shop normally" in the run up to Christmas, adding the UK has "diverse and resilient supply chains" and the majority of food does not enter the UK via Calais.

In other key developments:

*  Supermarkets have played down fears of immediate food shortages after the French border restrictions, but warned of "serious disruption" if the blockade is prolonged

*  UK-EU talks to agree a post-Brexit trade deal are set to continue after the two sides missed a deadline for terms set by the European parliament

*  The government has pledged to provide refunds for rail and coach tickets bought for the Christmas travel window between 23 - 27 December, after millions of people across the UK saw their festive plans severely restricted or scrapped

*  Shares in London have fallen sharply and the pound has lost ground since several countries closed their borders to the UK