On the nose. It's arguable that what the public think of as Northern Soul is actually part of mainstream pup culture these days, as opposed to a clearly defined subculture. And it's definitely not a youth subculture, which is where all the OPs original examples started, albeit they were periodically revived.
It's equally arguable that there's a less immediately obvious or popular rare soul subculture hanging in there, but I can't remember whether it's the Judean People's Front or the Popular People's Front of Judea... (splitters!)