Although French teachers have a reputation for striking, it’s actually been quite a while since there was large-scale strike action. I don’t think they’ll do it for this as we’re getting it from all sides anyway for having been on paid holiday for the whole of lockdown and then for the summer. (Despite all the parents who actually watched us teach the full timetable during lockdown).
The papers are all reporting that parents and businesses are thrilled by the announcement. Most of the parents I know aren’t thrilled. Several have said that they now feel they have to entirely cut contact with grand-parents as due to asymptomatic cases and lack of isolating, there’s even higher risk the children could spread it.
At lunch we were talking and most of my colleagues (secondary) agreed that we’d be sending our primary kids in with masks from now on to try to mitigate the risk to our primary colleagues 
. My two eldest will be wearing them. But my youngest is 3 and as much as I love his teacher I don’t think he’ll manage.
My really good friend at work is ECV, he didn’t come back at all before the summer. He was told to be in in September or give up his job. Same for all teachers. So I think it’s tough luck on any CV primary teachers. I’m hoping the unions might at least step up for them though.
They’re justifying it by saying that children are «not very active in the spread of Covid».
Sorry, yes, I forgot in the U.K. they have to have symptoms to be tested. Some close contacts were tested here regardless of symptoms, depending on how long it had been since the contact. But unless the kids get a fever and a cough, no one is going to be checking whether it’s spreading 8n primary schools. And I suspect any teachers who catch it will be told it’s come from outside school.
Anyway, basically they've insured teachers won’t be off isolating, and no one can link outbreaks to primary schools, and classes will be almost impossible to close.