The UK government has amended its foreign travel guidance to clarify that the Indian-made version of the AstraZeneca vaccine is an approved jab.
But it is not clear whether people from India can travel to the UK without having to self-isolate for 10 days.
The UK's refusal to recognise Covishield had triggered a firestorm of protests in India.
With more than 721 million doses administered so far, Covishield is India's primary vaccine.
On Tuesday, India described the rule as "discriminatory" and asked the UK to stop requiring fully-vaccinated Indians to self-isolate on arrival.