Just wanted to throw my own two cents in regarding the North/South thing. I can't speak from a whole lot of experience since I've not traveled around Wales extensively! But just from my own Bootcamp experience, what I've picked up from tv, books, radio, and from the stories I hear of other peoples travels, it seems that the North/South difference becomes more of a difference between learners. For example at Bootcamp, I'd studied the South course, but virtually everyone there studied the North course...led to a few head scratching moments on both of our parts (and a few more advanced learners were able to come to the rescue in those situations!) BUT I think a native speaker of the language, even if they were more likely to use certain vocab/constructions particular to their own area would of course still know the "other way" of saying it. They might still use their construction, but they would understand you!
Anyone with more authority care to comment??
