‘Sewers’, says Peter Ackroyd in London Under, ‘exercise a curious fascination upon otherwise healthy and happy people.’ They figure quite prominently in Ackroyd’s new book, from medieval waste pipes, through Joseph Bazalgette’s labyrinthine marvel (‘the most extensive and wonderful work of modern times,’ said the Observer in 1861), to the Thames Tideway Tunnel, a 32-kilometre-long sewage overflow running from Chiswick to Beckton and scheduled for completion in 2020. We meet rat-catchers, robbers and ‘toshers’, an underground breed who earned their living in the nineteenth century by scavenging in the raw sewage for objects of value.

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