Some interesting discussion(s) going on. (Well, 2 out of 3.) On the UK/England/Scotland/Ireland/North/Republic thing.
Because it's overlapping issues of history, ethnicity, nationhood, time. And no one is "wrong", and everyone speaking has very valid points.
About England/UK, Drico has excellent thoughts on the subject of "sphere of influence", culturally and politically, where the English have dominated and defined a lot of what "Britishness" is. But I tend to agree with Fugitive; while it might be forgivable for someone far-flung to occasionally use the terms interchangeably, ultimately I don't think is for an educated adult who's taken more than ten seconds' interest in the matter in their lives. It's not hard to seperate "British" from "English", really. I understand the sensitivities of the Scots and Welsh and those nine Manx separatists.

(Crazy partiers those guys).
And in Paddy's discussion with Mary, again no one's wrong, valid points, all respected. My dad's from Athleague, my mom's from Derry, so the difference between the Republic and the North is something I've been living with my whole life, experiencing, and thinking a lot about. I think I'm quite a bit older than you Paddy, and I'm truly thrilled that so much has changed since then, for the better.
I fully and wholeheartedly support your identification as being from Ireland, you are. (Why do you think I call it "Derry"?

) I think Mary's polite and sincere questions come from back then, there really was a Wall, a separation that was very real, as real as the soldiers in the streets when I was a kid there. And the blockades, the barbed wire, the dogs, the pat-downs and check-points, the bomb scares and car-searches. Derry in 1977 was intense, there were tanks in the streets. And I saw it all with my own eyes- it really was a different, bad time.
Anyway Mary's point I think was about the real cultural differences between the two parts of the island. And Drico's idea of "Sphere of influence" comes into play here, crossing the border then really did feel like a different country. The red mailboxes and telephone booths, the queen's picture on postage stamps, the Crown insignia on the soldiers' uniforms as they searched your mum's handbag.. it did feel like a different country, then.
It's the greatest happiness of my life that so much of that is in the past. Globalization, the EU, the peace process, Ireland's cultural growth and maturity is leaps and bounds better than it was. Sorry for prattling on- I am happy to be Irish, but I'm fond of the English, Scottish, Welsh as well. Even those tax-dogers on the Isle of Jersey. Past is past, onward and upward. Best to you Paddy, you're absolutely correct. Just (wordily) trying to suss some of the reasons it's so..complicated, and perhaps why Mary had curiosity there.