The problem is three weeks ago if felt like the lockdown was going to be for a longtime, it was new, people were worried, acting accordingly. Now it feels like the lockdown will be coming to an end soon, there are a lot less people telling you stay home save lives, and people are acting accordingly. Put it another way in the week or two before the lockdown many people pre-empted some aspects of the lockdown in one way or another of thier own volition - now the reverse is happening.
Not everyone will go back early. There'll be workers who refuse to go back to work/very cautious about going back to work. It's hard to assess for us, but I suspect that after lockdown ends, there will be less social contact than before. What level of social contact equates to how big the peaks of the waves of the virus is I don't know beyond looking at things like the Imperial study. The government will have to sort out a plan for the 12 week club, the shielders, what they can and can't do for the next couple of years.
You slip of the tongue talk of a 'risk' of a second peak - which unfortunately until recent days was exactly the language the government were using. If on the other hand even you don't believe it, then what chance that anyone out there will listen? This seems to be quite a strange one, you are worried about what others are doing and then effectively saying well I don't believe it anyway, but I'm going to behave differently to them even though neither of us believe any of this stuff.