I can't see if anyone's mentioned that for a large part of the population, they had lived through World War 2, coped with rationing and austerity into the 50s and many had done National Service. So there was much more tolerance of being told what to do and coping with hardship. I don't think people had such a sense of individual rights and self-expression.
There was also much less awareness of mental health, so probably the mental health crisis wouldn't have been seen as such. There was a lot of shame attached to MH and insensitivity in attitudes, so I think there would have been many people suffering silently with depression, anxiety, etc.
I think when I left school (1984) there were only around 15% going to university, so there would have been less panic about students travelling home/returning to uni and spreading Covid. But obviously no facilities at all for online study (but uni was free, so nobody demanding refunds either).
I can't imagine schools closing would have been such a big deal then either. There was no National Curriculum or Ofsted, so no measuring every aspect of education in the way that happens now. There were more mums at home though not as many as people imagine, but kids were just left alone or with older siblings, neighbours, etc much more than now. I can remember being home while my mum was at work when I was 7 or 8, and I think that was pretty common. Also, of course, much less awareness then about domestic violence, abuse, neglect, etc.
Thatcher would have certainly handled it in a more decisive way than Boris Johnson. But who knows whether she'd have made the right decisions.