Travellers arriving from Switzerland, the Czech Republic and Jamaica will have to quarantine from 4am on Saturday, the UK government has announced.
The new restrictions are coming into force in a bid to stem the spread of coronavirus.
Cuba, however, is being added to the list of countries exempt from quarantine.
Transport Secretary Grant Shapps said the decisions were “carefully made” after research from the Joint Biosecurity Centre.
Switzerland recently reported its highest 24-hour increase in cases since April
Holidaymakers hoping to squeeze in a break before the end of summer have had to wait nervously each week for the decision about changes to the so-called “travel corridors”.
Switzerland had been expected to be added to the quarantine list, after more than 300 new cases were recently reported in a 24-hour period – the highest increase since mid-April.
The UK government says countries which see infections rise above 20 per 100,000 people in a week are of particular concern.