On the other end you game the system by offering scholarships, and by selecting parents who are keen enough to part with a few tens of thousands of pounds a year.
I'm pretty surprised at the outright exam cheating though. My guess would be that if it happened it would be the teachers doctoring the papers without the students seeing it.
My impression of the UK school system is that they've done a lot with reducing bullying in the last couple of decades. It's visible when you visit a school that they care about it, and the kids have assemblies about it, something that would have been left to the kids themselves back in my day.