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.

'Harry Potter' star Daniel Radcliffe discovers that the Hatton Garden robbery of his great-grandfather’s jewellery business was far more dark and dramatic than he ever imagined, while an unseen cache of his great-great-uncle’s letters reveals a heart-wrenching First World War love story.

Actor Naomie Harris’s dramatic discoveries in this episode inspire her to anger, sadness and tears of joy. On a journey from Trinidad to Grenada to Jamaica, Naomie exposes her four-times-great grandfather’s involvement in the exploitation of so-called 'liberated Africans' shortly after the abolition of slavery, is delighted to discover the identify of her African five-times-great grandmother, and, in nearer generations, uncovers a family story of tragic poverty in Jamaica’s capital, Kingston.

In a first for the series, father-and-son comedy double-act Jack and Michael Whitehall join forces to investigate their family tree.

Oscar-winning actor Kate Winslet follows a rumour of Scandinavian ancestry on her mother's side of the family and is delighted to find that she has Swedish heritage.

Canadian comedian Katherine Ryan’s investigation of her family history leads her to a Methodist minister and his family in colonial Nova Scotia, cod traders in Newfoundland, and eventually to her English roots in Dorset.

Paul Merton traces the life of his maternal grandfather and discovers that he was involved in some of the key events that led to Irish independence in the 1920s.

Sharon Osbourne uncovers the difficult circumstances of her mother’s and grandmother’s lives, and is stunned to learn that her great-grandmother was born in the US.

Former TOWIE star Mark Wright discovers that his ancestors included an Andalucian master swordsman and a Spaniard who was burned at the stake during the Inquisition.

Our Girl actress Michelle Keegan uncovers some exceptional women on her family tree. On her mother's side Michelle discovers that her Gibraltarian great-grandmother Leonor had to up sticks when all women and children and the elderly were evacuated from harm's way in Gibraltar to the apparent safety of London during the Second World War, a month before the start of the Blitz.Further back, Michelle discovers her great-great-grandmother Elizabeth Kirwan living in poverty in Manchester at the start of the 20th century. Michelle unearths a special connection to suffragette Emmeline Pankhurst and her great-great-grandmother's commitment to the cause that put her name on the electoral roll - voting for the very first time in 1918.

Actress Olivia Colman claims to be 'the least adventurous person I know.' As for her ancestors, apart from a rumour that there was a Frenchwoman somewhere in her family tree, Olivia thinks they are largely from Norfolk, so she is astonished to discover that she needs to travel to India to find out more about her great-great-great-grandmother Harriot. Olivia finds records that reveal Harriot was an orphan in 1811 on a ship bound for England from (then) Calcutta. Harriot's father was an Englishman, but the identity of her mother, who gave birth to her in a remote Indian village, is a mystery Olivia delights in solving.

Comedian Lee Mack was born Lee McKillop in the north of England, just like his McKillop great-grandfather, who was also a comedian, known as Billy Mac. Lee has a few playbills from Billy Mac's variety hall performances, but knows little more about him. Not long into his journey, Lee discovers that his great-grandfather was passionate about more than making people laugh. Billy Mac joined the first ever pals battalion in Liverpool at the start of the First World War and honed his act at the front lines in the Battle of the Somme. Lee is also curious about his maternal grandad Joe's upbringing - deserted by his unwed mother and raised by his grandparents in County Mayo at the time of the Irish Civil War.

Iconic pop star Boy George grew up in south London in an Irish family. George expects to find a lot of sadness in his family tree. He knows that his maternal grandmother was found wandering the streets of Dublin as a small child and put in a children's home and wants to find out how she came to be in such a dire situation. He's also heard that another ancestor was hanged in Dublin's Mountjoy Gaol and is somehow connected to Kevin Barry who was commemorated in a well-known Irish rebel song. As George uncovers the grim details of what really happened to his grandmother and his great uncle, he also delights in a new sense of his family being truly part of Irish history.

Strictly Come Dancing's head judge Shirley Ballas investigates a family story that her maternal great-grandmother abandoned her husband and children for a more exciting life in America. What Shirley discovers casts her great-grandmother in a completely new light. On her father's side, Shirley pursues a rumour that she has black ancestors - a trail which leads her to colonial Cape Town and the era of slave trafficking to South Africa via the Indian Ocean.

DJ, presenter and former member of boy band JLS, Marvin Humes delves into his Jamaican and his English heritage, and finds exceptional stories on both sides of the family. Deep in the Jamaican countryside, Marvin's discoveries about the lives of his black ancestors during the time of slavery turn his expectations upside down. In England, Marvin's follows the trail of his great-grandfather about whom he knows almost nothing. But Marvin's research reveals a hero, who overcame a traumatic childhood to play a part in one of the most dramatic events of the Second World War.

Robert 'Judge' Rinder follows the story of his grandfather, a Holocaust survivor, hearing first-hand testimony of the horror of Nazi forced labour camps as well as of the hope offered by a new life in Lake Windermere. Investigating the dark mystery surrounding his great-grandfather leads Robert to a small town in Latvia, where he uncovers a story of mental illness and trauma which will ultimately, he hopes, lay some ghosts to rest.

Paralympic gold medal winner Jonnie Peacock was named for his maternal grandad, who died the year before he was born. Like Jonnie, his grandad was a sportsman - an excellent amateur footballer scouted by a professional team, only to be thwarted by parental pressure to take a 'proper job' as a painter/decorator. Pushing back down the generations, Jonnie uncovers the legacy of poverty and unexpected disease that led the family to value job security over the beautiful game. On his father's side, Jonnie is captivated by his four-times-great-grandmother, branded a 'bad character' in 1841 by a local village policeman. But Jonnie's further research reveals a strong woman prepared to stand up in court and testify against the men who had wronged her.

Actor Charles Dance has made his name playing aristocrats, including Tywin Lannister in HBO's Game of Thrones. But the upstairs world Charles inhabits on screen is nothing like his own background as his mum was an under house parlour maid. Charles wants to know if he comes from a long line of servants or if he can uncover some grander origins. He is also determined to learn about his dad, who died when Charles was four. Charles knows hardly anything about him, not even when he was born. Charles's search for information takes him to the other side of the world to meet close relatives he never knew he had.

Strictly judge Craig Revel Horwood reveals his softer side. Heading to his home town of Ballarat in Australia, Craig investigates what happened to his great-great-great-grandfather who risked everything in the Australian Gold Rush. A visit to his beloved 100-year-old grandmother sends Craig in pursuit of another maverick ancestor. Craig's great-great-grandfather Harry turns out to have been the life of the party and, better still, a fabulous dancer.

Sports presenter and broadcaster Clare Balding has always been curious about her maternal great-grandfather and the 'thing that has been sort of whispered in the family - could he have been gay?' Getting to the truth of the matter is a challenge when all the evidence comes from a time when homosexuality was illegal. Digging into her father's side of the family takes Clare to New Jersey and New York, where she uncovers an extraordinary dynasty and American roots stretching back generations.

Citizen Khan star Adil Ray identifies as Brummie, British, Muslim, Pakistani and African - his mum came to England from newly independent Kenya with her family in 1967. Heading back to east Africa, Adil traces his mixed Asian and African ancestry across Kenya to Uganda. On the trail of rumours of a link to African royalty, Adil meets African relatives for the first time in the traditional kingdom of Buganda and is amazed to discover the truth about his lineage.

Presenter Emma Willis grew up in Birmingham and loves the city and her fellow Brummies. She wants to find out how deep her roots are there. Further afield, an interfaith marriage in Ireland leads Emma down two very different paths. Violent events force her to confront disturbing truths about one ancestor, while the hard graft and determination of another lead Emma to draw parallels with her own life.

Pop star Lulu has always wanted to get to the bottom of a family mystery. She knows that her mum, the middle child of seven, was the only one to be given up by her birth parents and raised by another family, but she has no idea why. Lulu travels home to Glasgow, where she uncovers the real-life Romeo and Juliet story of her Catholic grandfather and Protestant grandmother's love affair across the city's strict sectarian divide. Digging deeper, she discovers some dark secrets about her grandfather's past which force her to reassess what she thought she knew about her mum's story.

Fearne Cotton is intrigued by her Welsh great-grandfather Evan Meredith who, despite working down a coal mine from the age of 13, ended up as a chemist in the home counties. Evan never talked about what he did during World War I, and Fearne decides to investigate. She is shocked to discover that Evan risked both his freedom and his reputation by following his conscience, caught up in a catch-22 situation with the authorities which was only broken when Evan took dramatic action. On her mother's side, Fearne finds an ancestor whose extraordinary professional ambition led to an encounter with Queen Victoria but ended in career disaster.

Actor and film-maker Noel Clarke grew up in west London with his single-parent mum, and this left one side of his family tree a mystery to him. His search starts in Trinidad, where both his parents are from, but soon takes him on a trail to other islands, ending on one of the smallest and most beautiful in the Caribbean. There he learns of an extraordinary great-great-great-great-grandfather called Glasgow Bedeau, who was born into slavery. The music Glasgow's enslaved parents and grandparents passed down reveals the part of Africa from which Noel's ancestors were taken.

Best known as market trader Donna Yates in EastEnders, actress Lisa Hammond wants to get to the bottom of why her paternal grandfather Harry Hammond never spoke about his experiences in World War II. She uncovers the moving story of the trauma he endured and his efforts to overcome it. On her mother's side of the family, Lisa is reassured to discover many generations of London stock as she finds the countryside unsettling. But her relief is short lived as, going further back, her investigations plunge her deep into rural Wales.

Ruby Wax's Jewish parents fled Vienna and the Nazis for America in 1938. 'They took the war with them and brought it to our kitchen,' says the comedian and mental-health campaigner at the start of this remarkable episode. They raised their only daughter in a dramatically dysfunctional household - Ruby's father was volatile and her mother 'hysterical... screaming in the street.' Ruby wonders if her own mental illness had its origins in her upbringing and the trauma her parents went through, or whether it is in her family's genes. Ruby journeys to central Europe, where she learns about her parents' flight and the distressing fate of family who remained in Vienna during the war, and she makes a startling discovery about her great-aunt and great-grandmother, which is both harrowing and surprisingly affirming.

EastEnders actor Danny Dyer hopes that he will 'freak a few people out' with his family history. Danny sets out to discover the history of his tough working-class family in the East End of London, but in the process he unearths an extraordinary lineage stretching back to the Norman conquest.

Amanda Holden has always heard stories about a rumoured French ancestry on her mum's side, and her investigation uncovers an extraordinary Napoleonic-era cross-channel romance. On her dad's side, Amanda's grandfather's suicide has always loomed large. But when his story takes Amanda to France once again, she is moved to discover how he helped others through a harrowing tragedy.

Wildlife presenter Liz Bonnin describes herself as 'a mongrel' - the result of her parents' lineages on the Caribbean islands of Trinidad and Martinique. In Trinidad, she goes in search of the first of her maternal ancestors to arrive on the island from India. Liz then heads to Martinique where her paternal ancestors are said to have owned plantation - and slaves. What she discovers is more complicated than she could have ever imagined.

Singer Cheryl traces her roots and discovers a sea-faring ancestor and a family tragedy.

Celebrity genealogy series. Ricky Tomlinson is well-known for playing the archetypal Scouser and it turns out that his Liverpool roots run deep. Ricky discovers that he comes from generations of carters, who transported goods on Liverpool's docks when the city was the British Empire's busiest port. Ricky's rage and sorrow build as he discovers how dangerous conditions were for his ancestors, eerily echoing his own fight for workers' rights in the 1970s.

As the 'last of the McKellens', Sir Ian admits to a degree of melancholy as he delves into his family history. But the results pay off richly for one of Britain's greatest actors and civil rights champions. Ian's journey uncovers a theatrical ancestor, a Victorian political activist and a link to an ancient Druidical landmark in the Lake District.

Greg Davies uncovers the deepest Welsh roots anyone could wish for.

Actor Warwick Davis owes his big break aged 11 to his paternal grandmother Edith, who heard a radio ad 'looking for short people to appear in Return of the Jedi'. Warwick takes a non-judgemental approach as he researches the family line stretching back from Edith, finding humanity and humour in some uncomfortable stories. On his maternal side, Warwick is equally open-minded when he finds out about his three-times-great-grandfather - a postman who lived a double life.

Actor Sunetra Sarker sets out to explore her Bengali heritage.

BBC News presenter Sophie Raworth investigates her father's side of the family, and discovers a tragic but inspiring tale of ancestors who risked everything to move to America in search of religious freedom. Closer to home, she explores a family rumour that her great grandfather worked at Kew Gardens, and is astonished to uncover a horticultural heritage stretching back to the 1700s and pineapples.

Paul Hollywood looks into his family's past this week. His journey takes him first to North Africa where his grandfather had only just completed his training when he found himself in Tunisia as part of the Light Anti-Aircraft division tasked with protecting infantry from enemy air attack during a major Allied offensive to take Tunis from the Germans. He then makes his way to Italy where he learns his grandfather was part of the landing force that became surrounded by German forces and trapped on the beaches at Anzio for four months.

Jane Seymour was born Joyce Penelope Wilhelmina Frankenberg and knows that there is Jewish ancestry on her father’s side of the family. She wants to find out about her Jewish great aunts Michaela and Jadwiga and their lives under Nazi occupation.

Actor Derek Jacobi discovers that he is descended from a Huguenot fleeing persecution.

Jerry Hall knows her father’s family originally came from Oldham, but wants to discover how they ended up in America.

Gareth Malone wants to know how far back his musical gene goes and he attempts to find out more. His investigations into his mother's side of the family take him to London's West End, where he learns that his great-great-grandfather was a star of musical comedy and performed in front of George V.

Actress Anne Reid was close to her father but knows very little about his family. She only has a couple of clues to go on - the name of a house in Scotland and a family story that her father's side were ministers in the church. These clues soon put her on the trail of her great-great-grandfather John Reid - not a minister at all, but a schoolteacher in Fife with a sideline in forgery. When John's forgeries land him in the dock his life takes an unexpected turn - to Tasmania, on a convict ship.

Journalist Frank Gardner was very close to his late mother and is keen to know more about her side of the family. Frank's mother always told him that the family arrived in Britain with the Normans. Frank sets off to discover if there is any truth in the rumour. Along the way, he traces his family tree back to his ten times great-grandfather Sir Michael Stanhope - a knight of the Tudor court - who was accused of treason. But Frank's journey doesn't end there, and he is astonished to discover that his mother's suspicions are closer to the truth than he could ever have imagined.

Journalist Anita Rani never met her maternal grandfather Sant Singh - all she has been told is that he suffered terrible tragedy at the time of India's Partition. Anita's mother also tells her that Sant had another wife and family before marrying Anita's grandmother. Armed with this knowledge, Anita travels to India to see if she can find out more about her grandfather's first family - and discover what happened to them during Partition. It's an extraordinary and harrowing journey for Anita.

Actor and writer Mark Gatiss has always had a love of storytelling and a passion for the ghastly and ghoulish but has always wondered where it comes from. So when he discovers that his mother's side of the family goes back five generations to the wilds of Northern Ireland, his imagination is awakened. Mark travels to Ireland, where he untangles a tale of rags to riches and finds out that his family were storytellers and (allegedly) vampire slayers!

Frances de la Tour's family tree holds a tantalising clue which hints at aristocratic ancestors. Hot on the trail of her three times great grandmother Frances uncovers a story of a secret lover, an illegitimate child and a landmark divorce case. But the scandal doesn't stop there. Tracing back another generation Frances uncovers the tragic story of Sophia Delaval - and traces her roots back to Seaton Delaval, the historic family residence.

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.

Actor Brian Blessed has always loved his unusual name but has no idea where his Blessed ancestors came from. Born in Yorkshire, he'd always assumed his family were northerners but, digging deeper, Brian discovers that his roots lie down south. Here he uncovers the story of his great-great-grandfather, Jabez Blessed - a tale of hardship, struggle and survival worthy of Oliver Twist.

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.

Brendan O'Carroll ditches his alter ego, Mrs Brown to turn detective, as he attempts to track down the men who murdered his grandfather at the height of the Irish War of Independence. Brendan never knew his grandfather, who was shot dead before he was born, and the only clues he has to go on are from a newspaper article of the time.

Actress Sheridan Smith has grown up surrounded by a musical family, singing with her country and western duo parents since she was a child. Sheridan is keen to know where her musical talent comes from and is soon hot on the trail of her great-great-grandfather Benjamin Doubleday. She's shocked to discover the dramatic fall in fortunes of this self-styled musical impresario and famous banjoist.

Bake Off star Mary Berry, still going strong at 79, believes she inherits her energy and drive from her father and sets off on a journey to find out more about his family. Along the way she discovers illegitimacy, bankruptcy, and even more astonishingly, a baker.

Actor Martin Shaw never knew his grandfather, Edwin Shaw, who walked out on his family when Martin's father was just a boy. Martin sets off to find out what happened to this elusive character with his only clue a photograph of Edwin as a young man. From a shotgun wedding to the Birmingham Blitz, Martin tries to sort fact from family fiction to discover who Edwin was.

Presenter and DJ Reggie Yates grew up knowing very little about his father's side of the family. Reggie sets out on the trail of his grandfather, Harry Philip Yates. His journey takes him to Ghana, where he unravels a complex family history where Ghanaian culture and British colonialism collide.

Scottish comedian and actor Billy Connolly has always considered himself Scottish through and through but as he travels to India in the footsteps of his army ancestors, he makes an extraordinary discovery. Not only was his great-great-great-grandfather present at a pivotal point in Indian history, through him Billy's connection to India runs deeper than he had ever imagined.

Twiggy grew up in London but her parents told her nothing at all about her family. She finds out about a history of strong women as well as a hint of crime.

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.

Samantha Womack is best known for playing Ronnie Mitchell in EastEnders. Sam's parents separated when she was young, and she grew up with only a fractured sense of her family history. Sam starts her journey by looking into the military career of her great grandfather, Alexander Cunningham Ryan.

Gregg Wallace sets out to solve a long-standing family mystery: what happened to his great-grandfather, Henry Roland Springett, who abandoned his wife and children, including Gregg's grandfather, and was thought to have deserted the Navy?

Sir Patrick Stewart's memory of his late father, Alfred Stewart, is scarred by recollections of domestic abuse. In this deeply personal and moving film, Patrick investigates his father's extraordinary war career, and discovers the shocking impact it had on his character.

Eurythmics singer and political activist Annie Lennox, whose grandmother's father died when she was only three, knows little about this branch of the family. Annie's episode uncovers an extraordinarily dark tale of tangled family relationships blighted by illegitimacy and poverty. On her journey, Annie also discovers the humiliation her unmarried great, great grandmother suffered before the Scottish church.

Comedian and actor Hugh Dennis's grandfathers both fought in the First World War, but rarely spoke about what they went through. In this episode, Hugh uncovers their very different wartime experiences. For his paternal grandfather, Ronald Dennis, the war offered an opportunity to finally escape a life in the coalmines of Yorkshire. For Hugh's maternal grandfather, Godfrey Hinnels, it was a brutal and bloody experience, as he found himself in some of the Great War's most infamous battles.

Actress Alex Kingston knows that her great-grandfather, William Keevil, died during the First World War, leaving behind a wife and young family - including Alex's then 4-year-old grandmother. Alex sets out to investigate exactly what happened to William, and discovers how his pre-war career as a photographer put him in an unusual position. Alex has also heard rumours of Jewish ancestry in her family tree. Her quest to discover if this is true takes an unexpected turn, leading to a story involving her four-times great-grandmother, Elizabeth Braham, another widow with young children. As Alex delves further into Elizabeth's life, she is astonished to discover the unconventional enterprise Elizabeth undertook to avoid sliding into poverty.

Actor William Roache has always known that his grandmother, Zillah Waddicor, ran a cafe in Alton Towers in the 1920s and 1930s, long before it became a theme park. But as Bill sets out to discover more about Zillah, whom he remembers as a kindly elderly lady, he is astonished to find out that the cafe was a far more ambitious enterprise and that, while overcoming a challenging personal life, Zillah was a trailblazing entrepreneur. Bill discovers that his great-grandfather James was also an innovative business person, dealing in some very unusual wares in late 19th century Blackpool.

Actress Celia Imrie knows that she comes from a long line of aristocrats on her mother's side, but has always resisted finding out any more about her illustrious heritage; her fear is that they will turn out to be privileged and boring, but she is quickly proved very wrong. In a film that ranges from political intrigue to impotence, Celia traces her family back to the 17th century. She discovers an ancestor who broke all the rules and ended up in the Tower of London, and investigates the extraordinary political legacy of another ancestor, who was accused of plotting to kill King Charles II.

Fifty years after Jamaica gained independence from Britain, former footballer and sports pundit John Barnes sets out to investigate the extraordinary role his grandfather, Frank Hill, played in the island's struggle for self-rule. John discovers how his grandfather became the subject of secret telegrams, and why he was interned by the British during World War Two. John also uncovers how, from being at the heart of Jamaican politics, Frank fell from grace among his political allies.

John Bishop finds out what happened to his great great grandfather, a POW in the Crimea.

During her search to find out if she is a real EastEnder, June unravels her Jewish heritage, and discovers how momentous historical events shaped her family's destiny, forcing them to migrate across Europe.

In a rare television appearance, best-selling Harry Potter author JK Rowling sets out to investigate her French roots.

The former Olympic gold medal winner sets out to discover if there is any truth in his grandmother's claims that the family's origins were once quite grand.

Actor Larry Lamb sets out to learn about his biological grandparents.

Silent Witness star Emilia Fox tries to find out how far back her family's acting roots go.

Alan Carr explores his family's football connection and his grandfather's brush with fame.

Bee Gees singer Robin Gibb discovers how his paternal great-grandfather rose from poverty to become a decorated soldier, and heads to Paisley, Renfrewshire, to investigate a mysterious family breakdown.

Richard Madeley sets out to learn more about the Canadian side of his family.

Strictly Come Dancing judge Len Goodman investigates his mother's family.

Tracey knows very little of her maternal line, and is keen to find out more about her East End roots

Bruce Forsyth receives a letter from America from a woman who claims to be related to Bruce through Bruce's great-grandfather, Joseph Forsyth Johnson. The letter suggests that Joseph Forsyth Johnson was married to two women at the same time and that he died at sea. Bruce is determined to investigate these claims and discover the truth for himself.

Rupert Everett’s varied acting career has involved starring in Hollywood films as diverse as My Best Friend’s Wedding, Shrek 2 and The Importance of Being Earnest. Rupert has a rigidly conservative background, and feels that much of his own life has been a reaction against it. Following the recent death of his father six months ago, he wants to investigate the paternal side of his family.

Irish actress Dervla Kirwan became a household name in the hit series Ballykissangel. But she has never spoken about her great-uncle Michael Collins, a national figure who changed Irish history and fought to establish the Irish Free State. Dervla wants to find out how her grandfather Finian, Michael's nephew, fits into the events shaped by his famous uncle.

Famous gardener Monty Don comes from a well-known dynasty of architects on his mother's side of the family, but knows little about his other relatives.

Actor Rupert Penry-Jones has made his name playing dashing, quintessentially English heroes. But his family background is very different. His mother, actress Angela Thorne, was born in Karachi, when it was part of British India.

Comedian Alexander Armstrong always knew his family background was likely to be privileged, but he's keen to find out exactly how posh he is...

Jason comes from showbiz parents who divorced when he was five. His British born father won custody and brought him up alone, but its Jason's mother's family line that holds the key to Jason's Australian heritage - up to now a complete mystery to him.

Holby City actor Hugh Quarshie was born in Ghana, but moved to Britain with his parents as a child. He knows there is Dutch ancestry in his family, but doesn't know where the bloodline began. To find out, he visits his uncle in Ghana, where he discovers a new relative and learns some interesting facts about his mother. Finally, he travels to the Netherlands to unravel the truth.

Award-winning actor and Broadway star Alan Cumming made his name acting in films such as Goldeneye and X-Men, but grew up in a small Scottish town. He tries to solve the mystery of his maternal grandfather, Thomas Darling. A career soldier who spent most of his life away from home serving in the army, he died, aged just 35, in mysterious circumstances in Malaysia.

In Holland and Germany, Rory Bremner delves into the wartime experiences of the father he didn't know very well.

Fiona Bruce discovers the sad truth behind her great-grandfather's mysterious death, and returns to her family's ancestral home.

Actress Zoe Wanamaker traces the roots of her family back to the Ukraine via America and the anti-communist witch-hunt that caused her father Sam to flee to the UK.

Actor Kevin Whately discovers that his ancestors were amongst the richest and most powerful men of the 17th century.

Davina McCall makes some intriguing and shocking discoveries as she delves into her family's past, hoping to learn more about her maternal French heritage.

Known for his outspoken views, Radio 1 DJ Chris Moyles finds himself getting unexpectedly emotional as he goes back to his Irish roots.

TV presenter Kate Humble knows little about her family history. What she does know is that her paternal grandfather was a test pilot, and she believes her maternal grandfather ended up in Colditz. On the trail of her grandfather Bill Humble, who was a test pilot during the Second World War, Kate visits the RAF Museum. She is astonished to discover what a legend Bill was in flying circles, and is amazed to see his daredevil flying for herself in archive film held there.

Actor and comedian David Mitchell goes in search of his Scottish roots.

Liverpool-born Kim Cattrall sets out to solve a family mystery that has endured for more than seventy years, the disappearance of her grandfather.

With his dad having died when he was 10 and his parents having divorced some years before, Martin Freeman tries to find out the paternal side of his family history.

Patsy's late father was a villain. Jimmy Kensit was deeply involved with the most notorious gangsters of 1960s London: the Krays and the Richardsons. Reggie Kray was even godfather to Patsy's brother. Apprehensively, Patsy embarked on an investigation into her father's murky past, to understand the roots of his criminality and to discover how far back 'the family trade' goes. Patsy met up with a criminologist who had unearthed a copy of her father’s criminal record, revealing the true extent of his crimes. She was then shocked to uncover documents in the National Archives that show her grandfather was also a prolific criminal. After more research, Patsy was at last relieved to discover that her great-grandfather, though impoverished, was an honest walking stick maker. Tracing her roots even further back, an amazing document in Goldsmith's Hall revealed how the Kensit family, once affluent artisans, first fell into terrible poverty. Ultimately Patsy made the emotional discovery that rather than descending from a long line of villains, one of her ancestors was a remarkable vicar who dedicated his life to helping the poor.

Boris Johnson knew a certain amount about his diverse family background, but was intrigued by several family stories and mysteries. He was particularly keen to investigate stories associated with the relatives of his paternal grandparents. Boris's grandfather, Wilfred Johnson, had never spoken about the murder of his Turkish father in the 1920s. Boris’s grandmother Irene Johnson (née Williams), known as 'Granny Butter', had always been the subject of derision in the family due to her grandiose claims of an aristocratic French background. So Boris set out on an international journey of discovery to separate fact from fiction.

Jerry knows that if his parents had not fled Germany before the start of the Second World War he would almost certainly not be alive today. As Jewish refugees, they settled in London before moving to the United States. Tragically, Jerry’s grandmothers were not so lucky. Unable to escape from the Nazis, both died in the Holocaust. Jerry sets out on an emotional journey to discover what happened to them. How far back can he trace the Springer family in Germany and did any of them survive the war?

If Esther's family is as genteel and respectable as she's always believed, where do the rumours of bigamy, fraud and murder come from? Stories of a 'black sheep' have always intrigued her, as have the origins of the Rantzen side of the family. Her search for answers takes her from the slums of Spitalfields in London to the diamond mines of South Africa. Along the way she discovers the amazing story of a fugitive from justice.

Ainsley Harriott heads to the West Indies and discovers that Caribbean history isn't quite as 'black and white' as he'd imagined. In addition to harrowing stories of slavery, Ainsley discovers his ancestors include a soldier, a policemen, wealthy 'free blacks' and even white plantation owners.

Confusion reigns in David Suchet's family history. Was his father's father German, Russian or Estonian? Was his name Suchedowitz, Suchet or Shoket? David’s mother's family is equally confusing. Was her grandfather really a French photographer? And why did another ancestor's ship sink off Norfolk? David travels across Europe hoping to find some answers.

Jodie has often wondered why none of her family ever talked about her mother's grandfather, Sir Rowland Hodge. Although she grew up with many stories about her other great-grandfather Lord Beaverbrook, Sir Rowland's past remains a mystery. Investigations in Newcastle and London soon reveal why, as Jodie uncovers a tale of scandal and political corruption. An exploration of Beaverbrook's ancestors takes her across the Atlantic to Colonial America and a connection to some of the first Puritan settlers.

"Most people assume that I'm from a long line of gothic, castle-dwelling Welsh gentry", says Laurence, "but I don't think I am". However, an old family letter hints that some of these assumptions may in fact be correct. Following a tantalising clue left by great-aunt Kitty, Laurence sets out to investigate. Is there a long lost family estate and fortune somewhere in Somerset? Could Laurence really be a member of the landed gentry?

Natasha travels to Cape Town in search of information about her father's involvement with the anti-apartheid movement during the 1960s. Later, after researching a possible connection with King George the Third, she travels with her Australian cousin Benni to Belarus where some disturbing discoveries are made about the persecution of her Jewish ancestors.

John looks into his great grandmother's parentage.

Griff Rhys Jones looks at both sides of his family's history, learning about the early British railway workers and trying to work out whether relatives really died in a train crash or there might be darker family secrets.

Carol explores her family tree.

Alistair McGowan explores his heritage from his father's side, investigating what 'Anglo-Indian' means by a journey to 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?

Julia's journey takes her to France and Jordan.

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.

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?

TV and radio presenter Nicky Campbell was adopted a few days after being born in 1961. Having already traced his biological parents some years later, Nicky now decides to trace the history of his adoptive family. He learns about his father Frank's experiences as an officer in Burma during the Second World War, and travels to his grandfather's birthplace in Brisbane, Australia.

The genealogy show celebrates ten years and 100 episodes with a look back at the outstanding moments of the award-winning series. This one-off special features the shocks, surprises, tears and laughter that have marked the 100 celebrities' extraordinary journeys into their family histories. It remembers the dramatic highlights, from Jeremy Paxman's tears to Boris Johnson's astonishment at his incredible royal connections, as well as the sometimes inadvertently funny bits.