THE Mail s readers have slammed Prime Minister Boris Johnson s decision on Friday to close all travel corridors. The move comes in an effort to protect the UK against new coronavirus strains, ending the quarantine exemption for arrivals from selected nations. He told a Downing Street press conference: “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.