We are now 2.5 weeks before the end of this academic year. If there was an efficient and realistic plan to reopen all schools by September, schools should already have had all the guidelines. Guess what. They have received nothing at all.
Usually schools have two inset days at the beginning of the new year. So maybe they will take 4 inset days instead. To implement loads and pages and pages worth of guidance on cleaning, social distancing, how to handle pupils who are ill, how to deal with pupils with high needs (medical needs) with good social distancing, source PPE if necessary, establish new routines and budget for cleaners, sort out the food halls (which are extremely busy, especially in large secondary schools), will they be able to do any sports, music, clubs, breakfast clubs and after school clubs, etc etc. My guess is, although I'd love all schools to reopen, it's not a realistic proposition as the government is not providing the right level of guidance or support.
They are just hiding their head in the sand and hoping it will all just go away. Same strategy all the way along.