Not ignorant at all! They are very interesting!
"Other than the obvious issues/differences, what would you say the main cultural differences are between people from North Korea and South Korea?"
It's hard to say since I never met anyone from the north but a few things I know. Well first they don't use the same words we do eg for ice cream, we just use the English word but they use a Korean word, or same with computer and lots of other Engoish words. They call each other "comrade", to almost everyone, we use different terms for each person eg older brother, older sister (even for friends who are older, we use this, not just real brother.) I think their life now is like our life 60 years ago, they live quite simply but more communal style like all make kim chi together and then share. If you watch the drama "Crash Landing on You" , you can see some element of north Korea life.
"Is quality of life better in Korea compared to the UK, would you say?"
Some parts yes and some no. First, internet, ours is so fast, you can download a movie in 10 seconds. Even on top of a mountain or the subway. Second, medical care in Korea is so fast and efficient. If you need treatment you can get it the same day, for example scan or testing. And you don't need an appointment to see the doctor. Third, transport is so good. And facilities like shopping or doctor is everywhere. And if you order anything online, it comes next day.
But stress in Korea is much more. Now I'm stay at home mum but when I worked, I worked 6 days a week, 8AM to 8PM and only 4 or 5 days vacation per year. That is normal (but getting a bit better these days, we normally only work 5 days now.) And even holidays like new year or our harvest festival (Chuseok), it's not enjoyable really. It's just stress of driving on highway to meet family who just nag you about job, appearance, family, money, grades, then drive back and highway is crowded with cars so it takes a long time.
So outward things look better, but people are stressed.
"Are there still a lot of traditional villages in Korea?"
There are hanok villages which use old style houses but they are mostly for tourists. In the countryside there are small villages but not traditional house and only old people live there.