I am laughing my little socks off at the poster who said contact tracing was easy in a school. I take it you are imagining a small primary school there with defined and discrete bubbles.
It is literally on T and T's list as a 'complex setting'.
People who keep saying 'there are no cases in my area' really are missing the point. None in mine either (apart, ironically from my DS's school!) but I am capable of knowing that it will get here.
Unless you are in mid Wales, parts of Cumbria, the Isle of Man, or the Highlands and Islands, there have absolutely been cases in schools in your area. Not necessarily outbreaks. For some reason , the local media isn't always reporting this. I wonder, why, she ponders cynically...
I don't think schools are cheifly responsible at this point in time for spread. But I do know the government is trying its best to disapprove of children getting tested, that it is extremely hard in many many areas to get a test, that parents are encouraged to send sick children in after one day off. Things will get worse in schools. The absence rate s already higher than average for the time of year. I also know that some people try very very hard to disprove that any cases in children or school staff arise form the school setting. Someone mentioned workplaces being 'stuffed' full, which clearly reveals an attitude against returns to workplaces there (and I tend to agree) but nowhere is more 'stuffed' than a school at peak fullness. SD is a myth. As, sadly, is handwashing,e except for in the youngest age settings, where it can be supervised and part of learning.
They always said reopening schools fully would increase the R so I am not sure why people are either surprised , or in denial.