As others have said, if the NHS site lets you in to book then there's capacity for your age group in your area. There will still be enough slots for the older people that still haven't come forward.
Individual areas are getting through their residents faster than others and vaccine supplies need to be used rather than temporarily stockpiled whilst large parts of the country wait for the slower areas to catch up. The work to get slower areas caught up is complicated and not just as simple as allowing more people to book - it takes time to secure new venues/volunteers/staff and, in some cases, convince different communities that the vaccine is safe and acceptable.
As others have said, if the NHS site lets you in to book then there's capacity for your age group in your area. There will still be enough slots for the older people that still haven't come forward.
Individual areas are getting through their residents faster than others and vaccine supplies need to be used rather than temporarily stockpiled whilst large parts of the country wait for the slower areas to catch up. The work to get slower areas caught up is complicated and not just as simple as allowing more people to book - it takes time to secure new venues/volunteers/staff and, in some cases, convince different communities that the vaccine is safe and acceptable.