I'm from the East of England and now live in the East Midlands, so I'm neither northern or southern. So I guess that makes me a true Angle-lander as my ancestors would have been the original Angle people from where England got it's name. however, the Angles and Saxons actually came from what is now Germany and the Netherlands
TBH, living in the middle, I've never really given the north/south divide much thought. I get on with Northerners just as well as I do with Southerners, Westerners, Midlanders, Easterners, Welsh and Scots. We're all British, and whilst we may have some different regional traditions, we all share a common heritage and should all be proud to be British.