Hunting around on the sometimes junk-filled playlist search on YMU, I ran into the very neat 'Union Jack Swing' playlist [YMU link], showcasing the best UK hiphop on YME, and created by 'lyndseylaunch', who is the Music Editor/Director of Yahoo! Music, according to their Y! profile.
The playlist description (there needs to be a way to cut and paste this, btw!), says: "The U.K. may have stricter gun control-laws, and its rappers may rhyme about such polite subjects as footie matches, pub quizzes, and mushy peas. And yes, these Brit-hoppers' crisp, lilting accents may be a little more Masterpiece Theater than Master P. But as Dizzee Rascal's knife wounds and Goldie Lookin Chain's voracious narcotic intake attest, life in Britain's council estates can still be hardscrabble indeed. Listen here for a bit of Brit grit from the 'hoods across the pound."
As well as some of the obvious but marvellous (The Streets, Roots Manuva), there's a bunch of good tracks from the 'Run The Road' grime compilation, and some neat, leftfield choices such as tracks from ex-pats like Slick Rick and Floetry - oh, and there's even Malcolm McLaren in there somewhere or other. 82 songs in total, well worth checking out.