The Foreign, Commonwealth and Development Office (FCDO) advisory has been updated and reads, "Following the peak of India's second COVID-19 wave in May, pressure on the Indian health care system has lifted, as the number of COVID-19 cases has fallen".
Only UK, EU and US approved vaccines are recognised for the fully vaccinated people and they can travel after two weeks of getting the second injection. Citizens from other countries, vaccinated abroad or unvaccinated, need to self-isolate at the address shared on the compulsory locator form for passengers.
The FCDO advisory further reads, "A limited number of flights between India and the UK continue to operate. To book tickets and to see important guidance prior to travel you should check airline websites," it notes.
Also, before you travel, do check the 'Entry Requirements' section for India's current entry restrictions and requirements as these may see some changes.