Coming from South Yorkshire, I guess I can't avoid coming under the 'northerner' group.
But as I left school in 1970 aged 16 (going on 17) I worked in a factory, but never considered it mundane or bleak as the TV programmes give the impression. Maybe it was because I was An apprentice learning a trade, I don't really know?
Anyway, the places I went to prior to and after leaving school, did play soul music, from new released Stax, Atlantic, Hot Wax, Invictus things mixed in with Motown and what I found out a little later, the older things - well 4 to 5 years older was a long time then!
They were things which had filtered out from the all nighters around the area, which would have been The Mojo, Twisted Wheel, and lots more which have been documented many times in the past.
It was just referred to as soul music as far as I recall, nothing else. Certainly not Northern, although I do remember Dave Godins articles using the 'Northern' term, I just assumed he was referring to people from the North, not particularly defining the musical style as such, although it obviously did happen later.
I remember my first venture to an all nighter being a disaster as a mate and myself decided to go to Crewe to Up The Junction - the night they decided there was no longer going to be any there! That would have been in 1972.
I can't recalling hearing the ' northern' term used out and about until after then, maybe during the next few years and that was mainly used by the younger kids who would then be hearing it after it started getting more popular / widely played after Wigan started getting in the papers etc.
But it's quite a few years back now, so maybe others remember it differently?