My experience, which I don't think is untypical, is that my first and second vaccinations were efficiently handled by my GP, and a local vaccination centre was established at Alderley Park which I didn't use but for which I read good reports.
The booster vaccination, on the other hand, was incompetently and inefficiently handled, in part because the process was delegated to pharmacies, with the closure of the local vaccination centre (albeit that one sort of "local" but significantly less convenient at the Etihad Stadium in Manchester remains) and with my GP trying to catch up with its backlog of appointments for non-Covid reasons. I should add that the booster vaccination itself was efficiently handled by the pharmacy, it was the process of booking the appointment and the fact that it was not as local to me as I'd preferred that was the problem, compounded by the constant changes of direction by government.
The latest changes I generally support, my criticism of the government has mainly been because it's done too little and too late, I accept that this time a potential over-reaction is warranted.
But it's going to put the pressure back on GPs and closed vaccination centres to deliver, the fact that it was done a few months ago means that it's not impossible to deliver again of course. My annual "business as usual" appointment with my GP has been delayed by two months this year, and I'm fortunate in not requiring an urgent appointment, so they're clearly struggling with non-Covid demand anyway.
So do the GPs repeat their processes of the first half of 2021 now? It will be a difficult decision for them.
EDIT Also, I think my general feeling is that it's important to make obtaining the booster vaccination as easy as possible, and I don't think enough focus has been put on this. For me, I got my vaccination despite the difficulty and inconvenience of doing so, and many others will be the same, so it's not for me that I say this. Also, there will be some who simply won't get the booster vaccination, and the process isn't the reason. But there will be a significant minority of people in the middle who will only take it up if it's made easy for them, and currently I don't see this being the case.