Here the PA news agency looks at the situation in nine countries:
Greece: It is aiming to reopen its borders to foreign tourists from May 14.
Visitors will be required to have been vaccinated, had a recent negative Covid-19 test or have coronavirus antibodies.
Spain: The country has said it wants to reopen its borders “as soon as possible”, but has not confirmed how or when UK holidaymakers will be welcomed.
It is considering the use of vaccine passports from May.
Portugal: The country expects to be open for UK visitors from May 17, which is the earliest date that people in England could be permitted to travel abroad for leisure.
It is likely that holidaymakers will be able to enter without restrictions if they show evidence that they have been vaccinated, have coronavirus antibodies or have received a recent negative test.
Israel: Groups of vaccinated tourists will be permitted from May 23.
They must take a pre-departure PCR test, and a post-arrival serological test to prove their vaccination status.