Covid vaccination programme is offering a "false sense of security" amid a mounting third wave of coronavirus infections, according to Government advisers who have called for next month’s unlocking to be delayed.Professor Ravi Gupta, a member of the New and Emerging Respiratory Virus Threats Advisory Group (Nervtag), said that with the UK in the grip of an "early" third wave of Covid-19 infections, ministers should consider pushing back their target of scrapping all Covid measures on June 21 "by a few weeks".The University of Cambridge academic said there had been an "exponential growth" in the number of cases, fuelled by the more transmissible Indian variant, but that the "explosive" impact it could have was currently being masked by the.