Despite this, it seems Britons remain hopeful all three nations will be included upon the next review.
According to Travel Counsellors’ UK, Spain, Greece and the US are the “top-selling overseas destinations” for holidays this summer.
The Government is set to review its travel lists every three weeks, taking into account COVID-19 data around the world, so more nations could be listed as “green” in the future.
She added: “We are delighted that the Government has given some clarity on which countries will be red, amber and green when the ban on non-essential travel is lifted on May 17.
“While the number of green countries is still relatively small it is gratifying to see that Portugal, the Azores and Madeira are on the list.
“We are also cautiously optimistic that more popular destinations could be added to the green list as their vaccination programmes gather pace.”
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Some experts are already calling for more nations to be added to the list in order to help the travel industry get back on its feet.
Paul Charles, CEO of The PC Agency travel consultancy, said: “This is a useful first step to restarting overseas travel from May 17 but there is so much more needed to boost consumer confidence and sales.
“There are so many more safe countries out there which could have been added to the green category.
Though travel is set to resume on May 17, the Transport Secretary warned Britons “should not” be travelling to any destination which is not on the “green list”.
He said: “Amber countries form the biggest group.
“As with the red list, you should not be travelling to these places right now.
Travellers returning from green countries will be able to jet off from May 17 without quarantine, however, they must take a pre-departure test.
Red list countries remain tied to hotel quarantine.
This means only UK residents and citizens will be able to return to the UK from these countries. They will then be required to pay, in advance, for a Government approved hotel quarantine stay which will include COVID-19 testing throughout.
This post originally appeared on Daily Express :: Travel Feed