OP, I’m a SAHM in SW London too. I get where you’re coming from. My DH is an entrepreneur and workaholic with no cut off between work and home life. Yes, myself and the DC have a beautiful home, independent schools and a super privileged lifestyle, but I think a lot if people just don’t get it when they make comments like, “tell him to cut his hours.” or “find a different job” or “go to work yourself.” If you haven’t been married with a man who is in a particular mindset, it’s hard to relate to. People simply don’t understand. And you have to put the DC’s needs first, otherwise who else will?
My DC are a little older now, so, in your position, I wouldn’t move them as it would affect their GCSEs etc.
I think the question for you boils down to how much trust do you have in your DH? Does he make you feel secure? Do you feel “noticed” enough? Do you feel loved?
My DH is nearly always consumed by work. It’s always, “ just get over this hurdle / deadline and then.... Then I can relax...” But after 16 or so years of this, I’ve come to realise that his work is neither here or there to his state of mind. This is how he is and he will inevitably find or create situations to justify this way of being. Doesn’t matter where we live or what job he’s doing.
Also, permanently being in “crisis” mode means that people are less likely to challenge him. Especially me, as his wife, knowing that our finances and lives depend on him. As time goes on, this becomes entrenched. Your whole life is facilitating the “DH show” - worrying about his stress; how can you help; the guilt; are you doing enough; giving him enough attention.... etc. Then you forget who you actually are beyond this role.
Anyway, its taken a year of therapy for me to get to this realisation - so just passing it in in case it’s relevant! I might sound resentful, but I’m not actually. It is what it is and there are people in far worse circumstances, obviously. Despite the way things have panned out, I do know that DH loves me and the DC and in his own mind, he’s works for us and he’s done it all to provide for us (even though I know he would be exactly the same if we didn’t exist)!
I think in your situation (with younger DC), I wouid probably have made the move. But ONLY on the proviso that he made some significant change to his work life balance - even if this meant making a conscious effort to not bring stress home. Or to moan less and look for the positives in his life. Or to not be in the mindset of needing someone to “blame” (it usually falls in the wife) for his stress. In other words, take responsibility for his own choices! Because his work is always a choice. Nobody (including you) forced him to be this way. It’s not your fault and you can’t change men life this. Nor do you have much control over him.
Also, can I just say, that people get very worked up on MN about SAHMs - it’s inevitably the same posters in every thread, regardless of the scenario. Try and let this wash over you because a lot of people simply won’t be able to relate to your circumstances and are only projecting their own agendas.
Good luck whatever you decide! By the way, I’ve lived in Sydney (pre DC) and it’s fabulous! Keep your home here if you do go. Nothing is ever set in stone and what will be will be!