All travellers entering the UK will be required to take two coronavirus tests while quarantining in an attempt to prevent variants entering the country.
Arrivals will be required to get a test on days two and eight of their 10-day quarantine period, whether they are isolating at home or in a hotel.The Department of Health said the move would enable authorities to track new cases more effectively.
Health Secretary Matt Hancock will set out more details in the Commons later.
It is in addition to the current rules which require travellers arriving in the UK - whether by boat, train or plane - to show proof of a negative Covid-19 test to be allowed entry.
This test must be taken in the 72 hours before travelling, and anyone arriving without one faces a fine of up to £500, with Border Force officials carrying out spot checks.
Travellers must provide contact details and their UK address. They can then travel - by public transport if necessary - to the place where they plan to self-isolate.