It's "the Warriors" in a dystopian modern Scotland. Gangs have formed around martial arts styles (really). The guys we're supposed to root for supposedly are TKD stylists. Watch and you tell me how much of that is TKD.
Dominic Monaghan is in it. Yes, that dude from "Lost" and "Lord of the Rings". Also stars Kevin McKidd as the big bad.
I cannot recommend this film highly enough for the general martial arts hijinks that ensue. Really awful, but hilariously so.