Do you have stats for teachers who "won't" go back? MN makes it seem much higher than it is.
In my staff of 140 I have:
2 shielding critically vulnerable partners, who technically should be in work and taking extra precautions at home, but who any GP would sign off with anxiety if they were "forced" to come in. We have plans for them to deliver lessons remotely into a classroom where students will be supervised by TAs. It's possible that they could deliver to two classrooms and thereby teach the whole class, rather than half, so it could even be better than if they were in. TBH their partners' conditions are such that they could probably be signed off with stress for that reason alone, regardless of a pandemic.
Then I have 4 with shielding letters of their own, also working remotely.
24 who are struggling to come in because of childcare issues of their own and no matter how "hard" I am, I can't see a solution for them. Most of them can do some time in school but not fulltime.
There is an element of people who are generally nervous or worried about vulnerabilities that don't put them in the shielding category, but there's been quite a shift in the last couple of weeks and they are now feeling better about returning, or at least accepting that they will have to.
IMO the unions have not been helpful to schools or staff. I understand their position is to protect staff at all costs and you can't argue with that but staff (with some exceptions) have not wanted to take the hard line the unions have suggested.