What exactly is "Northernness"? Where does "the North" start? ("North of the Tyne" is my usual answer.) As David Barnett suggests in this Independent piece on Oli Bentley's book project These Northern Types, there is no real consensus other than that the concepts exist, however nebulous and hard to define - and what's more, that they continue to hold meaning for people, whether positive or negative, whichever side of the great divide they're on (and wherever that dividing line might be).
(Thanks to Ben for the link.)