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Tim and Siddy visit the cathedral-like Greenwich Power Station, which stands ready to power the tube at short notice. Siddy visits hidden parts of Notting Hill Gate.
Tim and Siddy visit Quainton Road in rural Buckinghamshire, 50 miles from central London - and once on the underground. Siddy also explores Kingsway tramway tunnel.
Tim and Siddy explore the tube station with the most platforms, Baker Street. Siddy visits the disused Edgware Road Signal Cabin with its very last operator.