Bafta-winning actress, Julie Walters of Educating Rita, Mamma Mia! and Harry Potter fame, traces her roots back to County Mayo in western Ireland, where her great-grandfather, Anthony Clark was one of the first members of the Land League. The organisation was formed in 1879 and campaigned for more than 40 years for the rights of tenant farmers to own their own land.

New Tricks star Tamzin Outhwaite has always been intrigued by her Italian ancestry. Although she remembers her grandfather Remo, she knows very little about his family. Tamzin's journey into her Italian past uncovers the rags-to-riches tale of her great-grandfather, Adelmo and takes her on an unexpected trip.

Bill Oddie is the first celebrity to undergo the family tree search, as he endeavours to find out more about his mother, who was institutionalised when he was a child.

Actress Amanda Redman explores her roots.

Actress Sue Johnston explores her roots.

Jeremy is determined to find out if his mother was descended from the Kilner Jar people, and if they were, where all the money had gone.

Ian finds out more about the part his grandfathers played in the wars of the 20th Century.

Moira Stuart's family tree exploration takes from the Highlands of Scotland to the West Indies.

David explores his Jewish roots and discovers some Orthodox Jewish relatives in London.

Lesley explores her family tree in Yorkshire.

Meera's exploration takes her to the Punjab.

Was Vic's father a bigamist?

The stern host of BBC2's Newsnight searches for his roots.

Sheila Hancock chases after a mysterious woman in a photograph in the search for her roots.

An emotional journey as Stephen investigates his European Jewish roots.

Julian Clary investigates his roots through Europe.

Jane looks into her Lancashire roots.

Gurinder investigates her roots in Kenya and India.

Barbara roots extend through East London and Suffolk.

Robert's roots take him back to Derbyshire.

Colin's roots extend to Panama, Jamaica and Scotland.

David's quest to discover his family take him to the Isle of Mull, and then on to Londonderry, to confront an unexpected side to his ancestors.

David's roots are in Armenia.

What will Nigella find in her family tree?

Does Jeremy have roots in Ireland?