Secrets of the London Underground

Tim Dunn and Siddy Holloway explore the abandoned branch line between Holborn and Aldwych. And at Holloway Road they find out about the Tube's only spiral escalator.

Tim Dunn and Siddy Holloway visit North End under Hampstead Heath. Abandoned before completion, the station became a Cold War bunker.

Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, and visit the long-abandoned Highgate surface station.

Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere and the bits set for demolition for HS2.

Tim Dunn and Siddy Holloway have a night-time track walk exploring long forgotten stations on the District line in Whitechapel.

Tim Dunn and Siddy Holloway explore Clapham South deep level shelter where thousands of Londoners slept in the war.