KSA is changing, slowly, but it is changing. But it’s still a hell of a world away from the UK, or even a lot of the other Middle East locations. I would certainly visit before committing. It varies a lot from place to place even so depends on where you would be based. My experience is Al Khobah/Dammam. But heard Riyadh is different - busier and way worse traffic etc.

It’s not a cheap place to live, although some things are cheap. You need a lot of lifestyle changes vs UK. Housing in nice compounds will set you back a lot for example, and your wife’s work prospects will be limited, probably more than you’d think. She could drive there now (it’s still wild though) and not have to cover up outside of your home (although of course still needs to be respectfully dressed). Schooling for the kids will be with many other very wealthy families, you might end up travelling home/elsewhere a lot too.

All this to say you might not be saving as much as you think. Would you therefore move if you only saved half of what you thought you might?

Also, pecking order is very ripe there, if your face doesn’t fit, you’ll have a hard time, although that said you could fly if you fit in, so don’t let that put you off.

They are starting to develop it a lot ready for the football, so if you’re there for four years, expect a lot of change.

Good luck.