Britain's Secret Homes

In this episode, Michael Portillo, Simon Weston and Mark Williams visit homes across the country and discover the amazing secrets and fascinating tales that lie hidden within. These include a gothic house of horrors that inspired the greatest English detective story, and a multi-million pound flat that helped defeat the Nazis.

Ricky Tomlinson, Twiggy, Robert Pugh, Laurence Llewelyn-Bowen and Ann Widdecombe visit various homes and discover the amazing secrets and fascinating tales that lie hidden within, including a suburban semi in Liverpool that altered the history of music, a home in the clouds, and a castle that became a battle of the sexes.

David Harewood, Rory McGrath, Gethin Jones, Lucinda Lampton and Ann Widdecombe discover the amazing secrets and fascinating tales that lie hidden within homes. They include one in Scotland that led to a jailbreak from the Tower of London, an incredible 16-side house built to worship the sun and the 18th-century abode of a West African who was kidnapped and brought to London.

Greg Rusedski, photographer Rankin and journalist Rageh Omaar discover the amazing secrets and fascinating tales that lie hidden within homes in episode four. Homes featured include a Georgian pile that led to the building of the Titanic, a Scottish home that revolutionised Victorian photography and the garden that gave birth to lawn tennis.

The series concludes with Ronni Ancona, Mark Williams and Sir David Jason discovering the amazing secrets that put these homes at the top of the list, including the Shropshire house that saved the monarchy and a Lincoln restaurant with a tragic past.