Shockingly, I haven't been to London to stay...and to eat, since 2002. I'm going to remedy that over Memorial Day weekend.
I'll have four nights. One of those will definitely be dining at a friend's house.
Two nights I have pretty firmly in mind: Roganic and the Ledbury.
That leaves one night, and several lunches for which I'd love to hear your suggestions.
General guidelines are that I'm leaning Best of British, not cuisines that are equally great in New York, although I'm open to be convinced otherwise and that I (sadly) can only eat one major meal a day and barely that, so lunches that are lighter, small plates or snack-like are much appreciated.
Final thought is I'm not sure how many of these I'll be joined by friends for and how many solo (Ledbury group, Roganic solo, I think), so if it's a spot you can't enjoy without sharing a whole cow family-style it probably doesn't work. I haven't done St. John's because I love offal in doses but can sometimes get oddly squeamish, so that's an intentional omission.