Hi John,
Thanks again for your input 🙂
It looks like I might’ve solved the mystery!
Just on a hunch I created a brand new user and then logged in as them. It worked just fine. So the only reason it didn’t seem to be working was because it *was* acting correctly – e.g. an existing user had probably already chosen a county.
But thank you – at the very least because of your help I’ve discovered other things I can do with ACF!
Kev