Here the PA news agency looks at the situation in nine countries:
France is allowing UK visitors to enter if they have had a negative PCR test carried out 72 hours before departure.
But they must currently self-isolate for seven days on arrival, before taking another test. No date has been confirmed for when measures will be eased.
Cyprus: British nationals who have received both doses of a coronavirus vaccine will be welcomed from May 1 without needing to take tests or self-isolate.
Turkey expects to welcome UK holidaymakers this summer even if they have not been vaccinated or taken a recent test. It will assess its plan for the summer after April 15.
Malta: Fully vaccinated UK travellers will be welcomed from June 1.