I first encountered BCR types when I was an art student in Edinburgh in the mid-70s. I thought they were weird and menacing, and the music sucked donkeys balls. Turns out they came by it honestly:

https://www.theguardian.com/tv-and-radio/2023/jun/29/secrets-of-the-bay-city-rollers-review-one-of-the-most-disturbing-accounts-of-abuse-imaginable