I am from the south and live there now but I lived in Lancashire for a few years (my eldest son was born there). I find that wherever you are there are lots of really interesting local expressions.
(And I like the Kate Rusby song but I am irritated by her pronounciation of Duck too)
I worked for a few years in London and found that my northern accent was very amusing to the local folk they would mimic me all the time and it was very tiresome.. Their were 2 cockney lasses in the same office and their accents were undecipherable.