Anyone saying 'but my children went back to school' has failed no consider the total contrast between the conditions in school - and out of school - in June and September.
June: a maximum of 3/7 years back, in primary, maximum of 15 per class so typically half numbers or less overall. Strict 'bubbling', significant infection control still in place in the community - no playgrounds, children's clubs / activities, sports teams, swimming pools. Summer, so windows open, much teaching outside.
September: Everyone in school. 30+ per class. Strict bubbling impossible due to staffing, shared spaces such as toilets. Virtually no infection control in the community, with children also mingling in 'cross bubble' groups at after school care, children's clubs,. swimming pools etc etc.
In secondary the contrast is even greater:
June: Maximum of 1/4 of 2 out of 7 year groups in school, so 1/14th of school in at any time. Very small groups, with social distancing still enforced. Limited movement of teachers across groups. Very little school transport, and any that there is very empty.
September: Everyone in school, large groups, significant crowding in corridors, no social distancing, teachers moving across year groups and classes for every lesson. Crowded school transport, mixing pupils from all years.