I don't know what government agencies typically deal with stuff like this in the UK, but you might try to find out and report this. And if bootlegger pwnage ensues, please update your post with the whole story.
Bootleggers just piss me off. First of all, they take advantage of people who are too stupid to realize they could get this content for free on any number of P2P networks, not to mention they are profiting off the work of others. I'm not going to claim I don't download, but when you start making money off piracy, I think that's really crossing the line.
edit: Nevermind, it's in the US. I think the FBI deals with stuff like this, but probably only bothers going after very large bootlegging operations. Maybe the best place to start would be the Birmingham PD.