I haven't been to London in over a year and am looking to expand my list of favorite restaurants that serve food at their bar in a warm, comfortable, elegant but relaxed environment. (Polished, welcoming service, excellent cocktails and delicious food are also musts.) For me the gold standard of this is the bar at Corrigan's. (I also like the bar at Cecconi's, but it's more bustling than my ideal.) Cost is not a concern but I find that once prices rise to the point of "only for a special occasion", the atmosphere feels stiff and overly formal. I'm open to any cuisine. Recommendations?