Thanks Brian but I beg to differ, if only very slightly.
Dave's article in an issue of Blues & Soul in 1971, called 'The Soul Of The North' was about his first visit to the Twisted Wheel in Manchester. His observations were primarily about the 'scene' in the North (this was part of my original point) but yes, you're right, he was obviously struck by the difference in the type of Soul Music played in the North, differences that we are all well aware of.
The main point I was trying to make (obviously not well enough) was that Dave had tried to shake of the handle for some years after, as also mentioned by Mel Bratt above. Dave (like many of us) was first and foremost a Soul lover.
It's a question of interpretation I guess, pretty much like our own posts on the subject.
Many thanks
Sean