The UK has imposed a ban on non-UK citizens coming from Denmark amid concerns over a new coronavirus strain that has spread from mink to humans.
UK citizens will be able to return to Britain from Denmark – but will have to isolate along with all members of their household for 14 days.
The new rules update regulations that came into force just a day earlier.
The transport secretary announced the changes shortly after 02:00 GMT – less than two hours before they took effect.
Writing on Twitter, Grant Shapps said: “This decision to act quickly follows on from health authorities in Denmark reporting widespread outbreaks of coronavirus in mink farms. Keeping the UK public safe remains our top priority.”
Officials will contact anyone in the UK who has been in Denmark in the last fortnight to make sure they also self-isolate.
Denmark had been taken off the UK coronavirus travel corridors list on Friday after it first became apparent the mutated form of coronavirus was present in the country. It meant any passengers arriving in the UK from Denmark would need to self-isolate after their arrival.
The latest rules both bans foreign visitors who have been in or transited through Denmark and expands the self-isolation requirements for returning Britons and residents to include all members of their households.
They took effect at 04:00 GMT on Saturday – the same time passengers arriving in the UK from Germany or Sweden were required to self-isolate for 14 days after both countries were taken off the travel corridor list.
Freight and hauliers are currently exempt from the restrictions, but the Department for Transport (DfT) has said there will be an announcement on this later. Denmark was the UK’s 23rd largest export market in 2019, worth £6.8bn for goods and services.
Scottish airline Loganair said that due to government restrictions it has suspended flights between Scotland and Denmark from 9 to 22 November.
A mutated strain of coronavirus that has spread to humans has triggered culls of millions of mink across Denmark and a lockdown in some parts of the country.
More than 200 people have been infected with strains related to mink, according to reports.
Mink kept in large numbers on farms have caught the virus from infected workers. And, in a small number of cases, the virus has crossed back from mink to humans, picking up genetic changes on the way.
Mutations in some of the strains, which have infected a small number of people, are reported to involve the spike protein of the virus, which is targeted by some, but not all, vaccines being developed.
The coronavirus, like all viruses, mutates over time, but there is no evidence that any of the mutations pose an increased danger to people.
The World Health Organization has said it is too early to jump to conclusions.
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The Denmark travel ban and new requirements will be reviewed after a week, the DfT said.
A DfT spokewoman said the government was working closely with international partners to understand the changes in the virus that have been reported in Denmark and conducting a programme of further research in the UK “to inform our risk assessments”.
Mink-related mutations of the Covid have been detected in 200 people in Denmark, most of them are connected to farms in Denmark’s North Jutland region.
The Danish authorities have described the situation as very serious – and have ordered the cull of all mink in the country – thought to number around 17 million.
Danish authorities have said a lockdown will be introduced in some areas over the coronavirus mutation.
Leaving home to go on holiday is currently banned for most people in the UK.
In England, where a new national lockdown came into force on Thursday, people are still allowed to travel overseas for work or education trips.
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