Ibiza, Majorca, Menorca and Formentera are being moved onto the government’s amber travel list for England.
The Balearic Islands will join the list from 4am on Monday 19 July, just 15 days after they were promoted to the green travel list.
The Scottish and Welsh governments have confirmed they will do the same, and Northern Ireland is expected to follow.
From Monday, those who are not fully vaccinated or under 18 will have to quarantine on returning from an amber list country. Bizarrely, the requirement to self-isolate is being scrapped for the fully vaccinated and the under-18s from Monday in England, Scotland and Wales – but travellers in Northern Ireland will wait another week before the rule change comes about.
The British Virgin Islands are also moving to the amber list, while Cuba, Indonesia, Myanmar and Sierra Leone will be moved down to the strictest red list.
Bulgaria and Hong Kong will move up to the green list, while Croatia and Taiwan join the green ‘watchlist’ which means they are at risk of being shunted to amber.
The move is based on latest available data which indicates a big rise in cases in the Balearics following end-of-term summer parties.
Transport Secretary Grant Shapps said case rates had doubled since the islands were added to the green watchlist, which meant the government needed to “move quickly.”
“No-one can be out there thinking we can travel and just rely on things not changing”.