My wife is a teacher, secondary school, down here in Devon. It's pretty crazy, they are having to deal with staggered timetables, which means breaks are all at different times, which means the number of teachers needed to do "Duty" has increased massively, so there are now days where she literally can't go to the toilet or eat, as she is watching kids 100% of the day, and they can't ask another teacher to step in as that breaks bubbles.
Even down here with the levels of infection are really low there are loads of kids off, 11 in a class of 30 yesterday, none with confirmed infections, all just waiting for tests. Kids all been at home for 6 months, so are coming back and getting colds etc. but testing not happening quick enough to keep them in school.