Secrets of the London Underground S2, E4

A look behind the everyday facades of the London Underground network to see how its history and design made it the network we know today.

Cast:Tim Dunn , Siddy Holloway , Chris Nix , Mo Gajia , Roy Kenneth , Georgia Morley , Sam Mullins , David Leboff , Matt Brosnan , Charley Monroe , Antony Badsey-Ellis , David Bownes , Chris Eames , Simon Galbraith , Margaret Barford , Mike Guy , Vickie Aylward , Mark Dewhurst