I also work in a school and yes, as others have said, the transmission rate is rising....and this is amongst young children. The myth that small children don't pass the virus on is rubbish, they do (and I caught it from a child just before the last lockdown).
Small children may not suffer so much and many do not show symptoms, but they certainly pass the virus on.
Schools SHOULD BE SHUT. Yes, it's dreadful for education, for the children, for families trying to work, for exams.... But this is still a pandemic and if it's got so bad that another lockdown is necessary, then schools need to shut to make it worthwhile.
Some are arguing we should sacrifice everything just to keep schools open; I would argue, why are we sacrificing businesses, the country and the whole of the economy to keep schools open? The children will catch up in the future, there are many other ways of learning including a proper online service.
In addition, yes, I do feel why should I be following the rules to the letter when I'm stuck in a school with no PPE, no social distancing (small children find it too difficult) and teachers crammed into a small room all day with kids......who are then going to go home and pass the viruses that they have picked up in school, on to their families.
So I can't even visit my own family, even outside, but I can sit through that every day? Bloody bonkers......