Hotdogs (and Champagne). Burgers. Roast chicken. Even lobster rolls. For years, London has been at the forefront of the single-dish restaurant craze – and if some of this year’s latest openings are any indication, the trend is nowhere near waning. In fact, if you’re paying attention to cocktails in London, you might have noticed that it’s expanding beyond food altogether. Enter the era of the single spirit bar.