I know this story comes from the UK and we're not in their shoes, YET!
But I'm thinking how it serves as a warning for those parents who put their concerns on automatic by believing, "the school officials know what they're doing". Noted.
IMHO if you place your children in the care of strangers for eight hours a day the least you can do is keep VERY close tabs on whats happening in the classroom. Having grown up under exactly the opposite attitude I can tell you all kinds of shit goes on when there's no parental involvement.