Slur - I have heard a version of the history but I'm still not quite sure I grasp the logic of it!
I'd also say that when educationalists and Ofsted talk about "improving" schools they are barking up the wrong tree if they think the problem lies with the management, the teaching or the school buildings. Time and again it's shown that there is a correlation between achievement and socio-economic background. Statistical glitches aside, the schools which do best are those in the "leafy suburbs".
And yet these other factors - buildings, management, teaching style - are the things which are changed or marked for change. Probably because they can be changed, whereas you can't suddenly give 700 kids an injection and make them middle-class or high-achieving. The kids and their parents are the "raw material" - if that's flawed to begin with, you can't criticise the schools or the teachers for producing an imperfect product, or make it better by dressing it up in a prettier box.
My DW teaches at a tough school in a multi-cultural area with high deprivation, and yet Ofsted measures them against the same criteria as they would a white, middle-class, affluent area where most parents are professionals. It's as if they ask everyone to run a 100m race, and yet don't take account of the fact that some runners have a ball-and-chain attached to them or are starting from further behind the start line.
Teachers are furious at Ofsted's obsession with "averages" and labelling schools as below average. Well, duh, Ofsted, hello? If you have an average, there are going to be people below it. My DD could tell you that. It's like my working out an average height for kids, and declaring loftily that people should aim to be above that average height.