A decision to move Portugal from the Government's green list to amber has sparked a furious reaction from the travel industry.
But more countries look likely to be added to the green list in the coming weeks because of their improving coronavirus infection rates and an increase in the number vaccinated.
Many senior figures claimed data shows destinations such as Malta should have been put on the green tier, and questioned why Portugal was not put on a "green watchlist" to highlight it was at risk of being switched.
Paul Charles, chief executive of travel consultancy The PC Agency, was among leading figures in the sector who expressed outrage when Portugal was moved to the amber list last week, as it meant no viable major tourist destination was in the green tier.
Portugal and other countries such as Malta, Morocco and Grenada should be on the green list but decisions on restrictions were "highly political, not based on data at all", Mr Charles claimed.
Here are 10 countries that look likely to join those on the green list in the coming weeks, according to the Mirror.
1. Malta
Malta is arguably the stand-out candidate for being added to the green list.
It currently has a case rate of just seven and three quarters of the population have been vaccinated.
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When Malta was not turned green last time around Foreign Minister Evarist Bartolo had some scathing words to share.
"The (British government) is ignoring scientific advice. It has taken a political decision not to allow travel anywhere, despite the pressure it faces from airlines, tourism operators and the people in general," he wrote on Facebook.
2. Canary Islands
The island chain, which include destinations such as Tenerife, Fuerteventura and Gran Canaria, has been a long-time favourite with Brits wanting to get some sun and sand.
While it's currently classified as amber, its Covid rate of 38.4 (down from 34.7) and jab rate of 47.8 (up from 37.7) puts it on good footing.
3. Balearics
There has been much talk of separating certain island chains from their mainland country, and the numbers the Balearics are posting continue to make a strong case for this argument.
Its Covid rate is now 21.7 and first jab total 45.7%, compared to 38.4 and 37.7 on May 27.
Spain as a whole meanwhile has a disease rate of 61.5 and vaccination figures of 43.4%.
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The four largest islands are Mallorca/Majorca, Menorca/Minorca, Ibiza, and Formentera.
4. Germany
Currently amber, the continental European power house's numbers are going in the right direction.
It now has a coronavirus rate of 24.5 and jab rate of 46.7, improvements on 86.1 and 40.7 per cent.
5. USA
According to the PC Agency, a travel public relation firm which has been crunching the numbers on holiday destinations, the US currently has figures of that of a green list country.
At the moments its coronavirus case rate is 31 per 100,000 people, compared to a rate of 71.4 on May 27.
Just over half of the population have now been vaccinated once.
6. Italy
This was the first Western nation to become gripped by the virus and is now in a much better place.
It currently has a coronavirus rate of 27.5 and a single dose jab percentage of 45.4.
This is a big improvement from May 27, when its numbers were 80.3 and 35 per cent respectively.
7. Jamaica
Judging by its top-line figure alone, Jamaica is a strong contender to be on the green list - with a case rate of 14.4 making it one of the lowest in the world right now.
Whether due to its low first jab total of just 5.3 per cent or other factors, it remains on the amber list for now.
8. Finland
This Nordic country is one that is seeing its numbers go in the right direction, with case rates falling from 25 to 14.4 and jab percentage rising from 42.3 to 48.8.
These figures compare very favourably to fellow amber list nation Sweden, which has a coronavirus rate of 176.
9. Mexico
For many Brits, the idea of jetting off to Mexico would be a dream come true after a year and a half of the pandemic.
Its coronavirus case numbers remain very good, with 16.1 detected in the past seven days per 100,000.
The first dose figures of 19.1 are less good and rising slowly, however, meaning Mexico is an outside bet for the green list.
10. Poland
At present Poland has a case rate of eight and first-time jab figures of 39.8 per cent, a big improvement on 53 and 34.2 per cent this time two and a half weeks ago.
- People arriving in the UK from a green tier country are not required to self-isolate, while amber arrivals must quarantine at home for 10 days.
- The countries and territories currently on the green list are Australia, Brunei, the Falkland Islands, Faroe Islands, Israel and Jerusalem, New Zealand, Singapore, South Georgia and South Sandwich Islands, and St Helena, Ascension and Tristan da Cunha.