Yes, I have worked in schools, and know that children and hygiene are not natural bedfellows. But I also know that the children who are kept up to midnight watching porn with their parents would be far better off in school than stuck at home. My school took children from a problem estate, but I am sure it wasn't unique.
Research seemed totally divided as to whether children can pass it on easily or not. There is mercifully no case in the world of a child dying from CV picked up at school. So as with everything else it is individual risk assessment. If a child carer is looking after a mum or grandparent with conditions that make them extra vulnerable, then there is a big worry that they might bring it home. But equally school is probably the only respite these children get.
I don't think teachers will be at any serious risk of passing on the virus to children, who will shrug it off if they do. Children passing the virus to a teacher is a slight risk, but unless the teacher is obese or has serious underlying conditions, then I think we have to put the children first, and their education is vitally important, as is being with their peers, something virtual lessons can't provide.
Every child has a right to a full education in this Country, something sadly lacking in many other parts of the world, and it is something we shouldn't be taking away from them, except in very individual cases.