@RosesAndHellebores
People talk about the impact of parents on educational outcomes all the time. This thread is a perfect example of it.
People talk a lot about how parents can raise attainment, but are often reluctant (esp politicians) to talk about they bring it down, lest they be lambasted for blaming people in poor circumstances etc.
So I want to start by saying that the parents who DGAF don't do all they might can be found in all income brackets (hence the comment from one child, 'Mummy doesn't have time to read with me, she has to go to tennis.' Daddy didn't have time either. The child wasn't doing as well as she could have done, by a significant margin, and seemed to find learning a bit of a chore).
Some parents were themselves poorly served by the education system and don't see why they should bother. Some are themselves only semi-literate and lack confidence. Some think all education is the school's job (I've come across that in the middle-class income bracket too, with degree-educated parents). Some don't see widening their DCs' horizons as their job, so you have parents who will go for a week to Ibiza, leaving the kids with granny - and these kids have never been on a train despite the proximity of the station, or to the zoo ten miles away even though the family has access to a car.
And some of them have really chaotic home lives - and I'm not getting at anyone for splitting up with a partner, what matters is how it's done and the frequency with which it happens. Three daddies by 8, and the last one engaging in a custody battle about the baby half-sibling which was played out in front of the child... Not good. Some DC in those situations regard school as a bolthole and get on with their work, but many of them are too unsettled, distracted and upset to focus. In the modern parlance, 'they can't access the curriculum'.
Rather than banning private schools, we should be looking at the dynamics of families like these. I don't like the idea of intensive social engineering, and I don't have the answers, but we need to educate parents in basic child psychology.