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.

Andrew Lloyd Webber is astonished to uncover stories from his family’s history that uncannily parallel his own life, including an ancestor with a famous cello-playing brother!

As actress Claire Foy delves into her family tree, the personal testimony she uncovers reveals stories of tragedy and an accusation of murder that bring communities together.

Adventurer Bear Grylls discovers the stories behind the top secret documents hidden in his grandfather’s wartime trunk and is delighted by a Scottish royal connection.

Kevin Clifton investigates the rumour of an ancestor from Canada’s First Nations, taking him on an extraordinary journey to the country’s remote 18th-century trading posts.

Chris and Xand van Tulleken discover more about their Dutch heritage. Their research uncovers stories of ambition and true love but also a connection to a shameful part of history.

Comedian and actor Emily Atack knows she is from a long line of larger-than-life entertainers. Her mum is singer, actor and comedian Kate Robbins and Paul McCartney is Emily’s grandmother’s cousin, making him Emily’s first cousin twice removed. Recalling fun days out with the McCartney family when she was little and how Grandad Mike turned every opportunity into a comedy show, Emily sets out to find out more about her showbiz genes.

Dev Griffin learns about his ancestry, including momentous stories from Ireland and some very personal details from his great-grandparents' lives in Jamaica.

Chris Ramsey has always felt lucky, so he’s delighted to learn it runs in the family as he uncovers the stories of ancestors who survived a deadly WWI battle and won a lottery.

Lesley Manville is moved to discover a family story of enduring love and is delighted when an ancestor’s involvement in a riot reveals new relatives in Australia.

Vicky McClure goes on an emotional journey to Taiwan to find out what happened when her great-grandfather was captured as a prisoner of war in World War Two.

Paddy McGuinness uncovers his grandfather’s vital work in World War Two, how his other grandfather was involved in the Boer War and the family’s journey from Ireland to Bolton.

Melanie Chisholm is fascinated to discover that her ancestors include a moneylender, a campaigner for social reform and a family fleeing the famine in Ireland.

Actor, presenter and deaf rights campaigner Rose Ayling-Ellis goes in search of her family history. She encounters a pub landlady and hunts for a rumoured Italian connection.

Jessica Ennis-Hill discovers the truth behind a family mystery and finds out about her Jamaican four-time great-grandfather’s journey from enslavement to land ownership.

Olly Murs explores his grandfather’s Latvian roots, discovers his great-grandparents were circus performers, and how a wartime decision led to a tragic family estrangement.