INDIA has been added to the coronavirus "red list" in response to mounting concern about the number of cases there and the emergence of a variant.
The move, announced just hours after Boris Johnson was forced to cancel a trip to the country, comes into force at 4am on Friday, meaning Britons returning after that point will be forced to quarantine in a hotel for 10 days.
Anyone who is not a UK or Irish resident or a British citizen will be banned from entering the country if they have been in India in the previous 10 days.
Health Secretary Matt Hancock said so far 103 cases of the Indian variant had been identified in the UK.
Concern about variants of the disease - and whether existing vaccines will prove effective - has led to the Government ramping up plans for a campaign of booster shots later this year.
India 🇮🇳 has been added to England’s red list to protect the country against new and other existing variants of #COVID19.
Find out more about the latest travel update here 👉 https://t.co/35amjqRN5d#TravelSafely— Department for Transport (@transportgovuk) April 19, 2021
Mr Hancock told MPs: "We've recently seen a new variant first identified in India. We've now detected 103 cases of this variant, of which again the vast majority have links to international travel and have been picked up by our testing at the border."
Mr Hancock said the samples have been analysed to see if the new variant has any "concerning characteristics" such as greater transmissibility or resistance to treatments and vaccines.
He added: "After studying the data, and on a precautionary basis, we've made the difficult but vital decision to add India to the red list."
The Prime Minister had been due to travel to India on Sunday on a trip which had already been dramatically scaled back due to the pandemic.
Mr Johnson and his Indian counterpart Narendra Modi agreed the cancellation of the trip as New Delhi entered a week-long lockdown to tackle a surge in cases and prevent a collapse of the capital's health system, as India reported 273,810 new infections - the highest daily rise since the pandemic began.
The Prime Minister said: "I do think it's only sensible to postpone, given what's happened in India, the shape of the pandemic there."