Thailand and Singapore have been added to England’s travel corridor list, while Slovenia and Guadeloupe have been removed.
Transport secretary Grant Shapps confirmed the latest changes to the list in a tweet issued shortly before 5pm on Thursday (17 September).
"Latest data shows we need to remove Slovenia and Guadeloupe from the travel corridor list to keep everyone safe," said Shapps.
"This means if you arrive in the UK from these destinations after 4am [on] Saturday you will need to self-isolate for 14 days."
Shapps added: "Separately, we will be adding Singapore and Thailand to the travel corridor list. Please check before you travel as both countries may have extra requirements before entering."
Both countries, however, are currently not allowing short-term visitors, meaning they are effectively closed to tourists.
Anyone travelling to either country, even if they have government permission, will be required to self-isolate for 14 days on arrival.
Denmark had been expected to be removed from the list owing to a spike in its rate of coronavirus infection.
However, it was spared the axe this week. Portugal was also given a week’s grace after its rate of infection increased beyond the government’s 20 cases per 100,000 people over seven days threshold.