Qatar and the UAE, which includes Dubai, have been downgraded in terms of risk, together with Bahrain, where Gulf Air is based.
India, widely thought of as the source of the Delta variant, has also been given amber status.
The latest changes to the UK government’s traffic light regime, announced on Wednesday (4 August), will come into effect from 4am on Sunday (8 August).
The decision is likely to encourage Qatar Airways and Emirates to increase UK capacity, particularly following the decision on India.
