I enjoyed this and marked quite a few helpful tidbits, though perhaps some intense googling would have given up the same. A physical book of lost places, events, and buildings of London in one nifty format is more enjoyable and probably faster research.
This has perhaps a page to 4 devoted to each lost item, so it's not in-depth. It also ranges (haphazardly?) from Roman to Victorian to the 20th c, like mentioning a structure with events occurring in the 1950's. Since I'm biased to looking for Victorian period structures and events, that's a bit jarring, but the anecdotes do inform and entertain. Each entry is accompanied by an illustration.