A ban on travellers to the UK from South America, Portugal and Cape Verde will begin on Friday due to a new Covid variant identified in Brazil.
Transport Secretary Grant Shapps said the rules would come in from 04:00 GMT.
British and Irish citizens and foreign nationals with residence rights will still be able to travel but must isolate for 10 days.
On Thursday the UK reported a further 1,248 coronavirus deaths within 28 days of a positive test.
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