The problem is that people always say 'we need to return to normal because of the mental health of some people'. But returning to normal will cause mental health problems for others.
Some people's idea of returning to normal means meeting friends or family, hugging each other, not wearing masks in shops etc., going back to work in the work place (not WFH).
But there will be a lot of people who still won't meet up or who may not want to hug when they do, or who may prefer to wear masks or who ask (successfully) to WFH for the time being.
There was a woman on the radio who was getting very het up the other week. She missed her friends at work and thought everyone should be told to get back to the office - she was getting depressed because she missed the chats, friendships, after work pub visit on Friday night. Someone pointed out that, if even a few of those people continued to work from home, her friendships at work would look very different and that many people may well force themselves into go back into the office or wherever, but no one could force them to go to the pub after work. They also couldn't be forced to use the kitchen to make a cuppa whilst she was in there (a 'normal' way of socialising). She seemed genuinely shocked that some fellow workers just wouldn't take the extra risk of socialising or may not want to be in a small room (kitchen) with another person for any real length of time if they didn't have to. Which amazed me.
There's risk and there's risk - I'll go on holiday in a plane but I won't sky dive. My choice. Other love to take the bigger risk of sky diving or whatever. The choice is also mine about when and how I see my family (if they are also willing to meet up and it's OK with lockdown of course), whether I eat out or stay home with a take away, whether I go to the cinema or theatre. My choice - no one else's. So 'normality' will mean different things to different people and we have to get used to the idea that, for some people, functioning in a semi-lockdown for the moment makes them able to face the day, just as doing that for others is extremely hard.
Just because Boris says it's OK doesn't mean people have to go back to how they lived in 2019 and many won't for the moment - they'll watch how things go and put a toe in the water to test it now and then before they take the plunge. That's their right too.