Once again I must thank mos/ennui/asg for being a carbon sink and cancelling out my carbon emissions on my grand end-of-the-world tour.
I'm sad to report that London is doomed---the Thames is ALREADY flooding London on high tides. The Brits have built tidal locks to protect London from high tides but they won't stop rising sea levels. Much of central London will be severely impacted in a couple of decades and in 50-100 years it will be abandoned.
Meanwhile London today remains great----the old "half-price" ticket booth in Picadilly Square for last minute tickets to West End shows is gone, but you can still get them on line. I went to four shows in four nights, including performances at the grand old Royal Drury theatre, the new Sam Wannaker theatre at the Globe ---an exact replica of an Elizabethan indoor theatre right down to doing the Shakespeare plays with only candles for illumination, and a tiny theatre slotted in under the elevated metro tracks at the Embankment metro station.
The best play I saw was "Lady in White"---a little known Andrew Lloyd Weber play with wonderful music and lyrics. But you have to go fast---it was on a limited 6 week only engagement and closes in a couple of weeks.

London is doomed ---sea level rise caused by global warming will flood it. If you want to see it again, go soon.