Other rumoured destinations are Croatia, Malta, Denmark, Finland, Norway, and some Caribbean islands.
Calder said Portugal could also be on the list, but after a surge of cases in Lisbon this may not be safe.
The list will be added to throughout summer, with medium-haul destinations such as Turkey and Dubai potentially making the cut towards August.
For those eager to set off on a long-haul flight to Australia or New Zealand, this might be an option soon.
There are reports of a long-haul air bridge with the continents.
However, the USA, Mexico, and South American countries won’t be an option until at least the end of the year.