Ofsted, SATs, CQC etc etc, they are all flawed, they measure performance by ticking boxes, and dont consider variables. A few years ago (probably nearly 18 years ago) Mellor Primary School came top of the league tables for SATs, several years running, then if i remember correctly, dropped to 3rd or 4th. The reason? They took in a child with learning difficulties who skewed their results. The head teacher at the time pointed out to me what a nonsense the assessment process was.