Prime Minister Boris Johnson has announced the closure all travel corridors from Monday to protect the UK against new coronavirus strains.
It means anyone arriving in the UK will have to quarantine for 10 days and ends the exemption for some countries with lower coronavirus rates.
People will have the option of doing an extra test on day five to shorten the isolation period.
Mr Johnson told a Downing Street press conference the measure had been agreed with all the devolved administrations and would apply across the UK.
He said: “It’s precisely because we have the hope of that vaccine and the risk of new strains coming from overseas that we must take additional steps now to stop those strains from entering the country.
“Yesterday we announced that we’re banning flights from South America and Portugal and to protect us against the risk from as-yet-unidentified strains we will also temporarily close all travel corridors from 0400 on Monday.
“Following conversations with the devolved administrations we will act together so this applies across the whole of the UK.”