The government plan is to get children back ASAP as far as I can tell. Schools must adapt quickly, measures implemented, new risk assessments done/updated, and adhered to. Every time the guidance changes.
If SD measures were taken back to 1m that would allow around two thirds of each class back. And mean rearranging classrooms again. Some children will continue to shield.
But if bubbles became 30 there could be no SD. That thought worries me, but extra hygiene measure will have to remain in place - this will cut into learning time significantly and I don't know if parents are aware how long these things take in class.
9 yr R children take 10 minutes to wash hands, with having the sink cleaned between each use. Toilet breaks take twice as long as the cubicle and sinks need to be cleaned between each use. Handwashing takes place at least six times a day, on arrival, before and after break, before and after lunch, before going home. Plus additional for sneezes, picking noses and coughs.
Toilet breaks are roughly before and after break, and before and after lunch. Plus any additional time a child asks.
My DC want to go back, and it will be great when they can, but I am under no illusions that it will be the same as before.
Nor do I want it to be. We have had a Covid death in the family, MIL. That brings it all rather close to home.