The first episode of the current series of Great British Railway Journeys features a lot of stuff that appears in Subterranean City. Michael Portillo travels on the East London line, walks along Brunel's Thames Tunnel between Rotherhithe and Wapping in the company of the Brunel Museum's Robert Hulse (they may still have some leftover copies of the 250 I signed last year for Open House) and travels in the cab of a Javelin train from St Pancras to Chatham, passing through the tunnels just outside the London terminus. Even better, the series ends in Hastings. The first episode is available for the next 18 days here.
Author of Subterranean City, Beneath the Streets of London, London's Coffee Houses, Decadent London, The Folklore of London, Subterranean City (Revised and Expanded Edition), Netherwood, Last Resort of Aleister Crowley, Lord of Strange Deaths, the Fiendish World of Sax Rohmer; Secret Tunnels in England, Folklore and Fact