There are areas where a long trek is needed, encountering masses of people who won't wear masks and won't distance. For those with a car, fine. The rest, in Covid19 hotspots which are also crowded, cannot in safety get to and from a g p or pharmacy (still less a distant central hub) even if the jabs were on offer, which they are not.
One suspects that those 80, 90 year olds who were able to drive or be driven to central hubs, there to be filmed by journalists as they waited in icy conditions for hours in line, not particularly distanced and with some, even staff, using masks as chin covers, may have been mistaken. They may have assumed they are protected the moment the vaccine hits the arm. Wrong. it takes up to 21 days to have any effect. The virus they were exposed to on the way to and from the vaccine has three weeks to develop.
(Senior N.H,S managers might mistakenly believe everyone can easily travel to their 'hub', assuming everyone has a chauffeur, because they themselves never speak to poor people?).