London and the greater UK is often regarded as having one of the most progressive and forward thinking dance and electronic music scenes in the world. With the multi-national city that London is, it's easy to be seen as this sort of melting pot of artists who aren't scared to push sound in new directions, yet honor past musical traditions dance, hip-hop, and R&B.
With the steady and recent uprising of the UK Bass i.e. Dubstep movement it is becoming more common place for artists and producers of all genres to be taking cues from their UK counterparts. Of course, this isn't anything new... Look at the movement's that the music of The Beatles, The Rolling Stones, Elton John, and Led Zeppelin sparked for pete's sake!
Anyways, here's some absolutely top-notch producers shaping the UK sound at the moment.
*For maximum enjoyment listen to on headphones.