The wonderful week we spent in London was more about music and theater than dining, but of course, there are some food highlights:
Borough Market, thanks to Pat Hammond. What great fun! We went on a Saturday about noontime, and kept tasting. We found the scallop lady, and yes, it was memorable.
Note: if you go in the entrance from Borough High St., the scallop lady is at the opposite end of the market. Worth the search! And nearby was someone selling fresh-squeezed cool apple juice. Oh, joy!
Selfridges for salt beef sandwiches (though I had the oxtail tongue, which was fantastic).
I'm sure there are less expensive places, but this was warm, thick, freshly sliced, and you could get a half-sandwich.
Our location, near Wigmore Hall, was delightful. (On Welbeck St., about 2 squares north of Oxford St.)Walking north a square or so to Marylebone High St., we breakfasted every day at one of the many French patisseries where we had our morning coffee with an excellent croissant or pastry. That neighborhood is full of terrific bistros, ethnic restaurants, etc.
Thank you to the Chowhound who mentioned Giraffe and the prix-fixe dinner - very cheap - between 5 and 7. It was delicious, and the drinks were 2 for 1.
Upscale dinner out was at Locanda Locatelli, also walking distance from our neighborhood. Beautiful place and very good, especially the pastas.
Reliable and outstanding: Oslo Court, in St. John's Wood. This is where we meet our friends for either lunch or dinner whenever we are in London.
It is not creative or exotic - just excellent food, beautifully presented and done just right. It is a prix-fixe lunch or dinner. The menu includes very many appetizers and entrees; such things as fresh oysters, lobster salad, crepes, steak, rack of lamb, Dover sole, etc., etc. Luscious vegetables, family style. Lovely desserts.
It is always busy, and one needs to reserve way in advance. We went for a midweek lunch, and the place was packed. It was a ten minute bus ride from our neighborhood, and about five minutes on the tube. They may have a website.
Last - when it is late and most places are closed, there are always pleasant little spots open on James and St. Christopher Sts., also near where we were staying.
Thanks for everyone's help.