Kazzy,
For a secondary school to open under current guidelines, 3 whole schools'-worth of classroom-sized spaces need to be found, and equipped.
For each primary, you need to double the size of each school, so for each school, you need an extra schools'-worth of spaces.
All with hot and cold water, good toilets and appropriate furniture and equipment.
It's not going to happen.
What matters is driving down the infection rate, hard, through lockdown and track and trace. Extracting every morsel of data from current partial openings to assess and quantify actual risk. Engaging widely with well-respected educationalists, heads and local authorities to create a clear plan within the next week or two, that is well thought through and doesn't change, for a combined economy of in and out of school learning for September, and provide a set of clear checkpoints when additional data from ongoing studies may inform changes to that plan. Setting an end date for keyworker childcare, to release those spaces for everyone. Reviewing online learning tools used so far, including Oak Academy and the BBC, and aligning them rigorously to the national curriculum and the exam syllabuses to make them a genuine high quality alternative to being in school, thus releasing the full cohort of teachers to teach in school, knowing that their pupils are also well-supported when at home. Setting up hubs in local libraries and town halls where computers are available for those families without them, or without enough. Engaging with social services to look after vulnerable children, freeing up schools to focus purely on the educational challenge.