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?

Una Stubbs never got the chance to meet her paternal grandparents and learns that they didn't die until she was in her 20s. She manages to uncover a story of illegitimacy and poverty.

Nigel Havers takes a look at his mother's line and travels to Cornwall to learn about a tale of illegitimacy worthy of a period drama. On his father's side, he ends up in Colchester where he learns a tale of the Victorian equivalent of an Essex taxi driver made good, who ends up losing everything though.

Hollywood actress Minnie Driver is on a mission to find out more about her late father, Ronnie, and his family's background. Minnie's parents were not married, and Minnie only discovered when she was older that her father had a wife and another family all the time Minnie's parents were together. Minnie knows her father was awarded a medal for his role in the battle of Heligoland Bight during World War Two, but is shocked to discover that he apparently threw it away. She sets out to investigate why her father would relinquish such an honour. The trail leads Minnie to relatives she never knew existed, and she discovers a kindred spirit in the family.

Actress Lesley Sharp was adopted when she was just five weeks old. She traced her birth mother over twenty years ago and discovered that she was the result of her mother's affair with a married man. Now, knowing that her biological father has passed away, Lesley is ready to find out more about him. She traces her half siblings and follows her paternal line back to discover that her great great grandfather fostered Barnardo's children. Lesley follows the trail of one of them, George Maybury, to Canada to meet George's grandson and to find out what kind of home her great great grandfather provided.

Sports presenter and former footballer Gary Lineker follows the trail of his great, great great grandfather James Pratt, and discovers that James was a poacher in Victorian England and served time in Leicester Prison. Gary wants to know why James ended up becoming a repeat offender. Gary also wants to get to the bottom of how his four times great grandfather Thomas Billingham, who was born to an illiterate gardener, ended up becoming a highly-skilled legal clerk.

TV personality Nick Hewer has fond memories of his maternal Irish grandfather but has always been intrigued about how a Catholic managed to reach the prestigious office of high sheriff in Protestant-dominated 1920s Belfast. On his father's side, Nick goes further back - to his nine times great grandfather - and discovers how his family's fortunes were shaped by the English Civil War.

EastEnders star Nitin Ganatra moved to England from Kenya when he was just three years old. Now Nitin has questions about his identity and wants to investigate why his family left Kenya, and why they immigrated to Africa from India in the first place. The trail leads Nitin to Gujurat and his family's ancestral home. Along the way, Nitin makes an emotional and shocking discovery about his mother's family.

Comedian Sarah Millican is astonished to discover that her three times great grandfather was one of the first ever divers in the world. Sarah also follows the trail of her four times great grandfather, John Malcolm, to Canada where he worked for the Hudson's Bay Company. John was sent to a remote outpost involved in the fur trade. As Sarah follows in his footsteps, she makes a truly shocking discovery.

Singer and '60s pop icon Marianne Faithfull had a difficult relationship with her mother, Eva. In this film Marianne investigates Eva's earlier life, as a dancer in 1920s Berlin- the era immortalised in the film Cabaret. Marianne also discovers her half-Jewish mother's precarious existence in Vienna during World War Two and investigates whether there is any truth in the rumour that the family was involved with the Austrian Resistance.

Veteran BBC news reporter and world affairs editor John Simpson always thought his great grandfather was Samuel F Cody, famous for being the first person to fly in Britain and a Wild West entertainer. It was only later that John discovered that his great grandmother, Lela King, had run off with Cody, taking her children with her. John follows the trail of his adventurous great grandmother and her life with Cody, the cowboy turned aviator. He also investigates what happened to the husband Lela left behind, John's real great grandfather, and makes a shocking discovery.

Doctor Who actor Jodie Whittaker finds out how her great-great-grandfather worked his way up from child labourer in a Yorkshire coal mine to mine owner.

David Walliams learns of his great-grandfather’s traumatic experiences during the First World War, which condemned him to a lifetime in what was then called a lunatic asylum.

Actor Ruth Jones - Nessa from Gavin and Stacey - uncovers her grandfather's role in the Medical Aid Societies of south Wales, which provided a model for the NHS.

Silent Witness actor Liz Carr gets forensic about her family history, discovering that her great-great-great-grandfather was involved in an attempted murder in rural Northern Ireland in the 1850s.

Comedian Josh Widdicombe embarks on a rollercoaster ride through his extraordinary family history. After a less than promising start with an ancestor who was cut out of the family fortune, Josh is delighted to discover a courtier with very personal access to King Charles I. From there it’s a dizzying journey back to Elizabethan and Tudor nobility by way of a royal love triangle, through an incredible ancestral line that prompts Josh to ask the expert he meets, 'Be honest. As a historian, are you really jealous?' English