//Im not talking of covid side effects, what if someone collapsed in the queue with a heart attack?//
Which, of course, they could do whilst queuing to get into a bank or a supermarket or even waiting for a bus. You may as well say you need fully qualified doctors in those situations too. A doctor (practising or retired) would assist in any venue where somebody collapses. To suggest they must necessarily be present whilst people are queuing at a vaccination centre in case of that eventuality is somewhat missing the point.
But in any case, what about the apparent need for equality and diversity competence and child safety clearance?
I'm sorry bednobs but if if mindsets such as you demonstrate are present among those tasked with arranging for two million people a week to receive an injection, the whole country will be sorely disappointed.