Mum had her covid jab at one of the specially set up vaccination centres (Wirral). It was a local leisure centre, so after the jab you went to a large room next door, where they had chairs set out 2 metres apart. Probably around 20 chairs. You then had to wait
there until they told you to leave. They did have a tv on which made it more bearable.
20 chairs does slow it down, they'll need to stagger the jabs to run a 1 in 1 out of the waiting room.
Boss at work just told me his Dad has had both Pfizer shots now, he's a very active 80+ fella, but a pain in the arse as his attitude is "if it gets me it gets me".