@Wigeon
I can see they might use GP and pharmacies more in the SW, but the issue with the GP sites that the GP determine who gets invited, whereas if you are within the catchment of a mass hub you just get your record flagged and can use the booking system mentioned in this thread without your GP having opinion on your relative merit compared to others within their area (which is leading to patients not getting a vaccine in one area that they would in another).
I think the initial issue with inviting very old and frail people to mass hubs in group 1 was that they were allocated the hub and the appointment time so they could only accept or reject it.
Now with the booking system there is apparently a choice of venues (my DM had a choice of 2) so there is no need to exclude people based on their distance/time to reach a mass hub as there is now more choice.
Restricting people to 45 mins away is going to mean a lot of people in groups 5 and 6 wait a lot longer than necessary.