Tim and Siddy return with more Secrets of the London Underground in July

Yesterday TV’s Secrets of the London Underground will return in July with its fourth series, peering into the depths of the tube network. Over the ten weeks of the fourth series, rail historian Tim Dunn reunites with Siddy Holloway from the London Transport Museum to unearth more secrets about the Tube’s rich history.
(c) UKTV
As part of her work developing the museum’s Hidden London programme of tours, which takes the public into secret parts of the London Underground, Siddy h