Having had conversations about this on social media, with lots of "what ifs" thrown in, I've come to believe that it's too late to introduce any sort of COVID ID, as they should have been provided at the second vaccination. Some centres haven't provided any sort of written record, while others, like my health practice, have given little NHS cards showing the dates and type.
To achieve herd immunity a high proportion of the population needs to have been vaccinated, and to receive regular boosters, as with the flu. It's still not known what percentage of the population that should be. With measles, for example, it's 95%, and for polio it's 80%. COVID isn't going to go away and will continue to mutate, so without continuing restrictions it's going to take a while longer to control the pandemic here, but much longer internationally. Meanwhile, it would be irresponsible to permit mass gatherings or free access to anywhere that people congregate. Ironically, the most resistance to this is from younger people who either haven't had the vaccine or say they'll refuse it, which makes them the most vulnerable after anyone who can't have the vaccine for one reason or another. We don't have a fully compliant population and few people have recognised that there's no such thing as "normal" any more, that our economic system doesn't work when faced with catastrophes, and that climate change will force much more upheaval before long. Carrying on as usual is no longer possible.
Socialising in pubs or anywhere else where close contact is unavoidable would be very risky for anyone who hasn't been fully vaccinated. I certainly wouldn't take that risk, and anyone who does it isn't just risking their own health, but would be risking the health of hospitality and hospital staff, while spreading the contagion.
So, though it hasn't dawned on the bored and the restless, it's not over until it's over. Get used to it.
Oh, and an increasing number of people who've been infected are being diagnosed with long COVID, including already overstretched medical staff, which, if my experience of ME/CFS is anything to go by, can be a life-long condition. The two are remarkably similar and almost certainly a consequence of a viral infection.