The local surgeries got together down here and set up a flu vaccination 'pop-up' centre in the seaside car park (underwhelmed in October) on a Saturday and then 8 days later. Specific appointments (? 5 every 3 minutes?) were assigned by a patient's response by phone to an invitation letter. We were encouraged to arrive in a car on time (not before or after) Volunteers marshalled us in, access dependent on producing the already signed consent form/invite, plenty of 'holding pattern' space in the empty car park, and then called forward (by waving) to one of the 10 booths (10x10 tents), handed over form, bared upper arm, normal three Qs, stab, swab, 'away you go'.
I would be most surprised if this had not been set up as a test run for millions of vaccinations which will be needed across the country.
I estimate that they had the capacity to vaccinate 800 a day.
The advice if an invitee didn't have a car was 'get someone to help who has'. In a contented and generally mutually supportive community (30,000+ with an East Devon seaside town age distribution profile) I'm sure this worked fine. In the centre of conurbations where car ownership is a pain, it'd rather more difficult. I didn't try to turn up on a bike. I'm not sure how they would've handled that. I suspect part of the risk assessment (Covid-19 element) would identify the separation forced by patient in car and stabber (in some PPE) as a sufficient risk control measure.