“Westminster Abbey”. I agree, you MUST do this. There will be a loooong line, and it was “cash only” for the entry fee way back when I went on my honeymoon, so look into that before going. Plan on being inside for a long while because it is STUNNING. We did the little Thames River tour, it was OK - recommend if you have time. Be careful when crossing streets - the traffic comes from the wrong direction, LOL. And you must do Harrods.
Dining: the Indian foods tend to be much better than English foods.
Wow. The English foods must really suck. I didn't think Indian food was much better than anything.