I'm pretty sure Anaal Nathrakh is from Britain. They are a metal act, which doesn't necessarily count, but they are also the heaviest most rip-you-a-new-one thing I've ever heard in the genre.
http://myspace.com/anaalnathrakh
I like what Myspace has done for music. I don't like a lot of the "music" on it, but meh. It does a better job than a listening station in a shitty chain cd store.