I had my booster this morning at a dedicated vax centre, there were two lines outside, one for pre-booked and a huge one for walkups. The whole thing was very s

I had my booster this morning at a dedicated vax centre, there were two lines outside, one for pre-booked and a huge one for walkups. The whole thing was very slick, and extremely well marshalled by the volunteers, but you could definitely see a throughput issue with the waiting area - the movement of the queues wasn't constrained at all by the number of jabs they could give, but by the very large post-jab waiting area capacity. From entry to jabbed took maybe 3 minutes, but they couldn't move the queues any faster because of the backlog in the waiting area.