ef nowhere have I said that I made my child take a decision - I made my child realise that there are consequences. Neither did I sit back and say it was my child's choice. I manipulated a situation because it was in my DCs best interests that I did so.
Anything else is your interpretation of the very brief outline of my experience here, not my description of it.
I did what I did to protect my DC. I have no regrets, it worked, I would do it again but I don't foresee it ever arising again nor do I foresee a backlash in later years. If that does happen so be it, it will be too late by then for my DC to be harmed by their feckless ex. Anyhow, I don't need to defend my choices about my children.
I'd like to add that this is not the first child to move out of London to a more rural area nor would he be the last. (and FGS Norfolk isn't all fields and tractors! Is there any mention of RURAL in the OP, I can't remember, but Norfolk does have towns and cities too you know!) It is perfectly possible to cope, as other youngsters give good example. Nor would he be the first to move school at that age. The choice of new school will very much depend on the level of support he gets. My children moved schools when we moved house - my elder child was just shy of 15 and in the middle of GCSEs. Despite the change of school and location - and despite poor support from the school - my child has done exceptionally well and is predicted to get very good grades in a few weeks time.
A move with mum is not necessarily the disaster predicted - in fact, for many teenaged boys, depending on area they currently live in, school, the company they keep, likelihood of them being led astray and so on a move out of London might be a blessing in disguise.