I think that was a mangled reporting of a UKIP rally.
The Muzzies counter protested (and, according to what I have heard, were violent throwing bottles and whatnot). But the cops busted up the UKIP (which had the required permits, etc), not the Muzzies.
UKIP is a major political party.
Perhaps you are thinking of the BNP?.
The UK police arrest both sides if necessary.
Sorry, but the idea here that the Brit police leave the Muslims alone is not true.