Sitting atop the city of London, Duck & Waffle, the 24/7 high-rise destination restaurant and cocktail bar is something of an ethereal escape from the rat race below. Upon arrival, the dedicated entrance for those dining in the Heron Tower is something of a fun beginning, stepping into a glass elevator that whisks you from floor to forty in seconds, there’s a sense that whatever awaits atop your ride north has to be pretty slick.