You can tell when Nick Warren's on the decks. The music emanating from the DJ booth is that perfect club mix of driving percussion and soaring musicality, bursting out of the speakers, soaking everyone in melody, drenching them in sound. On the floor, where it really matters, the crowd experiences all the peaks and troughs that make Warren’s sensibility so unique. He might start with his deeper take on house, then gradually morph into harder territory; then