I think we are getting too hung up on what we "must" do, ie what the government will tell us to do, I think what will be the real clincher is what we, ie a large majority of the population, will simply decide to do.
My opinion is the new normal won't be very normal at all. Offices as we knew them, they're gone, sure there will still be a need for some people to go into work but the idea that tens of millions of us will return to getting out of bed at 7am every weekday morning to travel to work in a heated/air-conditioned office just to tap keys on a computer that we can do just as well at home is absurd. I am not saying whether this is a good thing or not, I am just stating it will be the reality.
I would be sweating if I was a bank or investment fund sitting on a huge amount of inner-city office space these days. Ditto hotels, sure we'll still need them now and again, but along with cruise ships and cheap mass tourism they have gone. Cinemas, finished.
Shopping malls, they were already on the way out, COVID will finish them off. As will at least half the pubs and restaurants, we aren't all going to be flooding back to them any time soon, no matter what people say about their desperate need for a pint. We survived drinking and eating from home for the past year, eating and drinking out, and the expense and inconvenience involved will wipe out most marginal venues.
Our entire work and leisure lives have been turned upside down, it won't be a simple matter of just flicking a switch on June 21. A lot of us will have decided the old normal was actually pretty shite and will not be in any hurry to return to it. Like I say, I make no judgement whether it will be a good thing, I simply call it as I see it.
The human species are pack animals, human face to face interaction makes us what we are., gregarious, chatty and needing hugs and kisses, its part of what we are. The pubs will slowly fill up, old mates who for over a year have been confined to the phone and skype, will relish a laugh, a piss take, and the general banter and chatter that a good pub atmosphere invokes.
Restaurants will again cater for family groups , with mother father kids and granny, enjoying the food, wine and family gossip. We will all slowly resume our lives as it was pre Covid, and in the fullness of time, like foot and mouth, the corned beef scare( ask your parents) horse meat in pies and pastries, and the blitz, (ask your grand parents) all will eventually return back to what was perceived as normal.
As i have never worked in an office, or shop, or any concrete and glass box, i cannot say how that scenario will pan out. Normal service will resume as soon as possible.
EDIT:- What will change i think, is that some form of ID showing vaccinations, will be needed, not mandatory, but without one, you will have a hell of a hard time shopping, cinemas, pubs, restaurant, etc, This could be incorporated on to your driving licence, along with your blood group, and any other relevant information deemed necessary by big brother.