Quarantine restrictions have been extended to Belgium, Andorra and the Bahamas, requiring international arrivals to self-isolate for 14 days from tomorrow (Saturday 8 August).
The Foreign Office has also updated its travel advice to warn against all but essential travel to the regions.
There are concerns that France could be added to the quarantine list, after it recorded its highest daily number of new Covid-19 cases in two months.
Brunei and Malaysia, meanwhile, have been added to list of travel corridors for the UK, having been assessed by the Joint Biosecurity Centre as posing a lower infection risk. The changes will come into force from 4am Tuesday 11 August.
In its statement the Department of Transport said: "The government has made consistently clear it will take decisive action if necessary to contain the virus, including removing countries from the travel corridors list rapidly if the public health risk of people returning from a particular country without self-isolating becomes too high."