I grew up abroad and I would say that there are pros and cons.
If it’s the weather and outdoor lifestyle you’re after then absolutely go for it assuming that you can come back to the UK any time.
However, a lot of that time you won’t be living the outdoor lifestyle because you will still have work, bills, the country you move to will still have its problems even if they’re different to the problems over here. It doesn’t matter where you go there are going to be people wishing they could leave to go somewhere else. It’s not a coincidence that there are so many Australians living in the UK who say they love it here more than in Aus.
Expect to see family only if you’re prepared to be the one who visits here not the other way around. Family say they’ll visit but they rarely do,sometimes never,and FaceTime really isn’t a substitute however much people tell you that it is. If you have small children be prepared for the fact they will never likely have a close relationship with extended family. And if you’re the one who visits here be prepared that you won’t have the holiday (or the money) to go anywhere else.
And IME most people abroad still are drawn to other Brits abroad, it happens the same with other countries as well but in general people will tell you that they know an awful lot of other Brits, and all these people gravitate towards each other hence why it’s considered to be the expat community. And so often they love their lifestyles abroad but still spend a lot of time reminiscing about “home.”
And healthcare is a consideration. As much as people slate the NHS, the NHS is still there, and anywhere else you will either not get the same level of healthcare or you’ll need to be sure you have good medical insurance. Again, it’s not a coincidence that many Brits travel back from other countries because of their health.
I grew up abroad and I wouldn’t change that for anything. But it’s naive to think that it’s always going to be sunshine and roses. Often it’s a case of swapping one set of problems for another.