The top scientist leading the government's vaccination programme has defended the decision to extend the time between the two doses of the jab.
Professor Jonathan Van-Tam said administering the second dose of the vaccine 12 weeks after the first instead of the original three "will save lives".
It comes as the NHS ramps up its coronavirus immunisation programme with the newly approved Oxford University and AstraZeneca jab.
The approval came almost a month after rollout of the vaccine developed by Pfizer and BioNTech began, with more than one million people having now received their first dose.