If people want to find someone to criticise for the disparity of provision between schools, then look to the government.
Schools were informed (well, I say that generously, lots of heads found out via social media) that schools were to close on 20th March, that GCSE and 'A' level exams and SATS wouldn't happen this year and that the curriculum was suspended.
Schools have been given NO guidelines about what - if any - learning/support they should provide at this time other than to provide childcare for the children of key workers or those who are vulnerable and to implement the supermarket vouchers for children in receipt of FSM. This scheme has been highly problematic to say the least.
In reponse to the OP, I honestly have not idea. I do think abstractly that children should be in school but I honestly can't see how this is possible at the moment.
Even putting the health of teachers aside for the moment (as many posters seem very keen to do...), I don't see how social distancing could be implemented in state schools, I don't know what teachers with children in year groups which haven't gone back or pre-school children would do. I can't see how the risk to teachers, other staff or children who are in shielded groups or sharing a household with someone in a shielded group would work.
Also, none of the problems of childcare/parents wfh will have magically disappeared by mid-July. What are peoples' plans for the summer re childcare?
Maybe a focus on yr 10 and 12 in terms of some provision to attend school with more thought through (centrally) distance learning, including grants for families to purchase broadband and loan of laptops etc for secondary?
Maybe to prepare for Y5 and Y6 in primary going back for a period of time late June/July?
I don't know. If one person in a school has symptoms and tests positive, will the whole school and their households need to self-isolate for 14 days? Or will this be per class? What about shared toilet facilities etc?
It would be helpful if people who actually knew anything about the day to day realities of state schools were involved in making these decisions, which excludes the current cabinet unfortunately.