Britain will on Monday set out plans to restart international travel, using a "traffic-light" system as the country cautiously emerges from lockdown.
The announcement comes as the UK has set a tentative date of May 17 to relaunch international travel.
Travel destinations will be ranked green, amber or red according to virus risk, Downing Street said in a statement late Saturday, with the government to provide more details on Monday.
International travel is currently banned except for a handful of permitted reasons. This has created massive pent-up demand for summer holidays abroad.
People heading to low-risk "green" countries will simply take a virus test before and after they travel, the government said.
But those going to amber or red countries will have to self-isolate or quarantine afterwards.
Currently people arriving in the UK from abroad are required to self-isolate for 10 days.
British nationals who arrive from a banned "red list" of high-risk countries face costly quarantine in government-approved hotels.
The government urged people not to book summer holidays, saying it was "too early to predict" which would be the green-lighted countries.