Holidaymakers returning from Christmas and New Year breaks in the Indian Ocean and southern Africa will have to quarantine for 10 days from 9 January.
England will also ban all non-British and non-Irish nationals from several countries including Namibia, Zimbabwe, Zambia, Angola, Botswana, Mauritius and the Seychelles, also from Saturday.
UK and Irish citizens who have visited the above countries will be allowed to enter, but they will have to isolate for 10 days from 9 January to prevent the spread of the new South Africa variants of coronavirus.
The UK has already banned visitors from South Africa.
The latest restriction being introduced by the Department for Transport also applies to arrivals from Mozambique, Lesotho, Malawi and Estwatina.
The requirement to quarantine will apply from 4am on Saturday to anyone who has travelled from or through any of the above countries in the previous 10 days.
It is expected that Scotland, Wales and Northern Ireland will adopt the same policy, which will be in place for an initial two weeks.
Like the new strain of coronavirus first detected in Kent, England, the South Africa variant appears to be more contagious than previous strains.
England could introduce compulsory Covid tests for all arrivals within days
In further attempts to limit the spread of the disease, the UK is planning to introduce Covid screening of all passengers, including returning holidaymakers.
Prime Minister Boris Johnson confirmed the move at his Downing Street briefing earlier this week, and Transport Secretary Grant Shapps confirmed on Friday that UK arrivals will have to present a negative Covid test ‘from next week’ but the Government has yet to reveal further details of how and when the screening will take place.
Speculation has emerged on social media that the UK will insist on compulsory Covid tests for all arrivals, including returning holidaymakers, from next Thursday.
However, this hasn’t been officially confirmed.