Ireland, Scotland, Wales, Italy, Spain. They've all said schools will go back in September. In England, what is the point of all this faff and worry for the sake of a few year groups to get a handful of school hours for a few weeks?
This energy could be so much better used.

It would be MUCH wiser to spend this time ensuring schools can do distance learning really well, with min expectations for what parents can expect. While also getting schools to estimate who needs and would use part-time supervision in June/July (alongside keyworker kids).

That way there would be two types of schooling: part-time and distance. Then, ready for September, schools could start planning for full-time, part-time and distance strands working in parallel - potentially with personal tutoring built around it for those falling behind.