You can’t talk about dancehall in the U.K. right now without mentioning The Heatwave, the London sound crew led by Gabriel Heatwave and Benjamin D. Their roving party Hot Wuk is one of the country’s top bashment events, no question, while their remixes have helped fuel the success of such local productions as Stylo G’s “Call Me a Yardie.” With “Stopwatch,” they have entered the realm of original production on a track featuring Heatwave family member K’More.