Well, I think I'm finally beaten!
After four months of agony, I confess that DS has worn me down with his begging to be allowed to go to the local comp with his (mostly awful) friends instead of to the private school which we wanted him to go to, but which would have required a move away. To be fair, he's mostly given up begging, but the emotional trauma has just been too much and I've decided I can't do it to him.
However we're seeing this as an opportunity to exercise a bit of leverage: 'We'll let you go to X High School IF you agree to do x, y, z - and if there's ANY trouble or your work isn't up to scratch, you'll be out of there and into the school of our choosing so fast you won't know what's happening' kind of thing.
With this in mind, we'd like to keep the private school offer open, not least because we suspect that if we applied again now - or after 'trouble' at the other high school - he might not get in again because of his behaviour (frankly the offer came as a shock the first time lol)! We're in England now but the private school is in Scotland where year 7 is actually the final year of primary, so effectively he wouldn't have been going to high school PROPER until next year anyway.
Can I write and ask them to defer his entry until year 8 (S1 in Scotland)? I have no knowledge of private schools and no idea whether this is a thing people do. DH says they'll agree because they just want our money but I think they might say no and that we have to reapply.
And what would happen if they DO agree, and we defer, but then things turn out better than expected at our local comp and we decide to forget about the private school altogether, this time next year? Will they be so pissed off with us for messing them around TWICE that they charge us a penalty of a term's fees or something, even if we give them enough notice?