United Kingdom (UK) has announced the closure of all travel corridors from Monday in order to “protect against the risk of as yet unidentified new strains” of Covid-19.

According to reports, anyone flying into the country from overseas will have to show proof of a negative Covid test before setting off, reports said.

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The change comes into force at 0400 (GMT) on Monday and means all passengers must have a recent negative coronavirus test and transfer immediately into isolation upon arrival.

The isolation period lasts for 10 days unless the passenger tests negative after five days.

Prime Minister Boris Johnson made the announcement in a press conference when he praised the country’s vaccination programme.

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He however also warned: “What we don’t want to see is all that hard work undone by the arrival of a new variant that is vaccine busting.”

The British prime minister said the new rules would be in place until at least February 15.

Travel corridors were introduced in the summer in UK to allow people travelling from countries with low numbers of coronavirus cases to come to UK without having to get quarantined on arrival.