I live in NI, and, while I wouldn't say it's very common, there are some people who go to school on the other side of the border. I'm pretty sure they are "grannying" and use a family member's address on the other side of the border.
And I was just wondering if this happens on the England/ Scotland border? Do you have to pretend you live in the other country? I imagine it's not a big thing on the England/ Wales border because afaik it's the same school system? Maybe I'm wrong.
I was inspired by reading an article about Berwick upon Tweed while deciding on my holiday to England.