I think you’ve gotta ask yourself if this is all realistic Nathan...
My experience is that the grass is never greener, and wherever you live, you take your problems with you. Bare that in mind.
I don’t doubt that the scenery can help people with mental illness, but I’d question whether it’d work in the long term.
It’d be a lot of stress moving, starting a fresh round, just relocating as a whole.
Making new friendship groups etc can be hard as well.
I don’t know, I’m not you, but either you’ll go for it, or it’ll fizzle out when you realise how hard it will be in reality to start a fresh.
Why don’t you condense your work into that first three weeks, then by a static caravan (or whatever) in Scotland and take the family there for long weekends/half terms etc? Best of both worlds then...