Our schools probably don't have any extremely high risk employees but the 'vulnerable' group who are the same risk as over 70s includes eg people with asthma which is a huge range of severity in itself. How are these people going to do social distancing whilst teaching in a full school? If they can't presumably we still pay them not to come in and we therefore have no resource to replace them even if supply was available which it won't be. If protecting them will involve PPE we don't have any and not sure how we'll get it given the restrictions. You do have to use PPE properly for it to work eg don't contaminate it by touching your face etc and teachers have no experience or training on that.
People who live with vulnerable people aren't on any list but try telling that to the teacher whose husband is having chemotherapy for cancer or the TA who lives with her elderly parents. In our expensive town that's really common. Do we tell them they have to move out or lose their jobs?
I work in the NHS and as a larger organisation we have more wiggle room. My colleagues who are vulnerable have been redeployed to non face to face work and so far that has been OK as so much routine work is cancelled. When it starts up again I guess they also have to risk going back to face to face work or lose their jobs.
Public sector employers need official guidance on how to handle this stuff.