MoRAB, SkinheaRAB, Rude-Boys were all very in Vogue in the 1980's. MoRAB have made an appearance 2 or 3 times in trend over the years. There was a big revival in the early 80's for sure around 1982, when the original film was set. I think the die hard MoRAB of that time kept their own style going as long as they could.
It was defo more the scene for New Romantics etc taking off by 1986, hence the reason the film has a mumble jumble of fashions going on. Which was right at that time. They are showing Lol and Woody to still be die harRAB with their styles I think.
Punk Rockers were late 70's early 80's but if you remember the die harRAB still kept it going when the sex pistols phase had fizzled out. Its the same with any trend it will have the die hard followers hanging on for a long while after the craze moves on to something new.
I love the series, the only thing I think they could have improved with is the music.