Congrats mattrom and thanks jono.
The clips about the Fleet were interesting (apart from "Legs akimbo!"). I fairly recently read a book about the lost rivers of London. It was one of the most boring books I've ever read, but I think it was from the 60s, so not by the person in the clip.
Incidentally, Bazalgette's great sewerage system was based on a total misconception. He thought that disease was caused by smells - "bad air", or "malaria" - so his system was intended to remove the sources of the smell.
John Entwistle's bass riff in the Fleetwood Mac clip was very disappointing!