I am now settled in at my London office (a.k.a. the Regent Street Apple store, with its free WiFi).
The flights this morning were uneventful and, for a change, my Heathrow arrival gate was actually CLOSE to the arrivals hall. (Usually my gate there is a four-mile hike from the center of the terminal.) I did get grilled by a woman at Passport Control. I thought the U.S. and the U.K. enjoyed a "special relationship," but you'd have thought I presented an Iraqi passport. I had to explain my whole trip, why I stopped in England, how long I was staying, and whether I had a hotel reservation. Once I showed a ticket for my Wednesday flight, I was allowed into Britain.
I took the Piccadilly line to the Gloucester Road exit; my hotel is just a block away.