From Monday travellers coming from 33 red list states to England will be required to quarantine for 11 nights at a hotel close to one of four airports, Heathrow, Gatwick, London City or Birmingham, or the business jet hub of Farnborough in Hampshire.
All international arrivals to Scotland have to stay at hotels near Aberdeen, Edinburgh and Glasgow airports.
At the same time, the testing regime for anybody arriving in the UK has been stepped up. All travellers must provide evidence of a negative evaluation in the 72 hours before departure to Britain, then book tests on days two and eight.
Trades unions have called for protection for UK Border Force staff, resort workers and security personnel.