I thought that the Pfizer vaccine has been licensed for 12+ in the UK.
I would have thought that the results of the more recent 'test' events can't possibly have been analysed yet. And if they have, I don't recall them having been published. So that's not data we have to hand.
I did read somewhere that the post event testing was voluntary after the Liverpool night club event. If it was, that doesn't fill me with any confidence. But I couldn't find anything to confirm it. And, were they using the discredited Lateral Flow tests?
But we still come back to the fact that herd immunity is usually achieved by vaccination, not by mass infection. If it were, we'd be immune to all sorts of things that are currently vaccinated for...
What the scientists who are anti wholesale lifting of restrictions are saying is that this is like a huge experiment being carried out on a mass of people who haven't been asked to give, or have given, their consent. Any scientist surely knows that that is completely unethical? No proposal for a scientific study would be given the go ahead, or funding, if what was proposed was unethical.