I think I do need to be more resilient and take charge a bit more. I have had a tendency to run crying to H when things are hard, and he probably felt like that, even though that's not what I was after.
For 180s - I've made an appointment with Eldest's Head of House at school to discuss behaviour at home. His behaviour at school is absolutely exemplary, and part of me thinks he will be mortified if his teacher hears how he's been speaking to and treating his parents - and that might be enough, for the time being, to make him think twice. But there's also a couple of sports residentials coming in the next couple of months and I want the school's support that he won't be attending them unless behaviour at home improves.