'Smash the State' by Dead Viscous:
https://piped.video/watch?v=H2yA2cKfvzA
The responsible uncles of the Welly punk scene, circa the noughties. I was at the street party where this video was filmed and the cops were just as ignorant and violent as they come across in it.
I had totally forgotten until I rewatched it that I appear in this video a few times. I'll leave it as a fun game for the viewer to guess which one is me : )