The schools need significant investment to be able to meet the guidelines and get all children back in school.
Assuming new class sizes of 15 (which is actually fantastic, great for kids to have that size class).
Temporary classrooms and canteens need to be created as quickly as possible, potentially split site/ new schools being created.
Longer term development into permanent buildings to replace these temporary classrooms over time.
Immediate recruitment and fast track training of teachers.
Support re deployment of teachers who cannot return due to shielding into work from home roles, supporting distance learning for shielding children or other jobs as appropriate.
Proper distance learning options that give a good education for shielding children who cannot return to school.
Thing is, this would cost an absolute fortune. It is clear the gov doesn’t think our children and teachers are actually worth it. But it would be possible, and personally I think it should have been well underway by now!