My child was at a school where the OFSTED was so glowing, it looked as though the head must have written it. People rent in the catchment and never move in just to get their children there.
In Reception DS started talking about suicide, he was so unhappy. They insisted all was well as he was reading at a high level. He was being brutally bullied. I said I suspected autism, they said no way and that he was Level 3 in EYFS for forming relationships and self awareness.
I took him to look around another school and within 15 minutes, the teacher took me aside and asked if I had ever heard of Aspergers. I moved him there and then, and he was formally diagnosed 7 weeks later. It's a small village school with a genuinely gentle and inclusive atmosphere, and he is accepted and supported. The kids play across the age ranges and have mixed age classes, so the maturity/social skill development levels are wide. I think that helps.
The first school accused another mother of Munchausens the same year. Her child had been diagnosed by a paediatrican at a point when the mother had had no idea there was a problem - she worked for a paed, who spotted it. Pretty weird form of the disorder, never to seek any diagnosis at any stage. But her child was seemingly "normal" (she has PDA) so they just got stuck in without ever bothering to contact the treating paediatrician. That family also moved to a small village school, and are very happy. In fact I know another who did the same and are - but a family on the Early Bird in yet another were very unhappy with it, so not a panacea.
It was an Academy, so not much we could do. They managed to publish a letter they'd written to the other child's paed on their open website a year after she left, too, because it was floating around the school's shared drive for anyone to see and some idiot posted it as a test for uploads. It discussed her diagnosis and the relationship with the family in some detail.
The only part of OFSTED worth looking at is the overall Parent View: most significantly, how the school reacts to outside comment, and would the parents recommend it to others. The rest... well, the old school spent a lot of money on paid external consultants, so they could stage to OFSTED. Everything they did was for OFSTED. If OFSTED didn't observe or mark, it wasn't something they cared about.
Ironically, my son is gifted, which is why he was doing well despite his misery. Now he's not pressured, pushed, and desperately unhappy, he is doing staggeringly well. He was underperforming, but because they had no idea how high his potential truly was, they thought he was doing well.
He doesn't exactly have friends at the current school, but he's well liked and included. Which is a massive, massive improvement.
My only regret is that we didn't move him a great deal earlier.