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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 brand new Elizabeth Line - and have access to 2 of its stations weeks before the line opens. Siddy also explores the disused parts of Angel.
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.