London is an awesome city but maintain situational awareness, my FRiend, AT ALL TIMES.
My Son in the US Navy was assigned to the US Embassy. The Embassy was in charge of his housing. They had a garden apartment about a block south of Abbey Road. It was a beautiful place. Went there in 08, near the tube station I thought I had entered an Arab country. Anyway, check out The London Eye, the Tower tour is great. If you can go, go see Stonehenge its worth the trip. While there I talked to a young lady who was there with her stunning German Shepard, she told me she was from Nottingham, I asked her how the Sheriff and Robin Hood were doing, she laughed and she said she gets that a lot from Yanks. See the Wartime tour of Churchills bunker. Its like the Brits gathered all the worlds treasures in one City.