Most people over 80 in Britain will have to wait until next year to get the coronavirus vaccine, a top health official says.
Chris Hopson, chief executive of NHS Providers, said the "vast majority" of people at the top of the priority list won't get a jab until January, February or March.
Professor Stephen Powis, NHS national medical director, said the distribution of the vaccine would be a "marathon not a sprint".
Vaccinations will be administered at dozens of hospital hubs from Tuesday - dubbed "V-Day" by Health Secretary Matt Hancock - with people aged 80 and older, care home workers and NHS workers who are at higher risk at the front of the queue.