He reminds me of a reggae producer called Mad Professor who's always banging on about how reggae nights in London are full of white middle class 40 somethings.
Well I happen to go to a lot of reggae events around the country and they're more often than not split 50/50 between black and white people.
He probably went to one skinhead do and based his "facts" on that. He should try going to a do such as "Mash It Up" in Islington where it's all about the music being played and not image or where people come from.
As for Northern, well I think it's just a case of when things took off in the early 70s the places integral to the scene such as Wigan. Blackpool, Stoke, et al, didn't have much of an Afro-Caribbean community. Also the people from the Afro-Caribbean communites often preferred to have parties around each others' houses. known as "blues dances" and thus never went to venues.
Gordy