Unions will be doing what they exist to do and protecting the health of their members.
Until Boris can provide teachers with a safe workplace ie PPE for all staff, adequate social distancing, etc, unions will be telling members not to go in.
And if they do open, I won't be sending my child in as they wouldn't learn anything in the last few weeks under these conditions, and the health risks not only to the children, but to the teachers and parents, are not worth it.
Plus my child relies on a school bus to get to school and there is zero way of socially distancing on one of them. Or of running 3 school buses, say, per route, at an affordable cost.
Also, my dc is happy as Larry off school, and learning as much or more. Let's face it, how many kids object to longer school holidays? I know there are some eg vulnerable kids, but they can already attend at present.
Fed up of threads pretending all parents can't wait for schools to reopen. Not among the ones I know.