In many countries, schools are continuously closed during the summer for longer than they were during the British lockdowns. Schools here were closed for most pupils only for a few months, once in spring 2020 and once at the beginning of 2021.
I'm sorry but I don't really believe it that everyone's kids became desocialised and regressed in their learning so much during such a short amount of time simply from not being in a collective learning environment for a few months. There must be other causes.
Could it be that the rampant Covid infections themselves that children are being subjected to since they've returned to school, are affecting their health, including mentally/intellectually? There were some recent studies that show Covid infections can cause brain shrinkage and other forms of brain damage.
Could it be that the trauma of a global pandemic was, well, traumatising in general, and that the current attitude of not addressing said trauma and pretending it never happened is harming young people?
Or: could it also be that UK school itself is a harmful environment, overly crowded, conformist and abusive, and once the children had a brief escape from it, they realised how bad it really was, and didn't want to return?
No, it can't be, right? Business as usual is great, it must be the lockdowns.