Martin heads to London to find out more about the cause of the deaths of Aida and Richards children, visiting the Great Ormond Street Hospital to meet a paediatric consultant.

When he was just 10 years old, Martin Freeman's father died of a heart attack. As a child, the actor tried to show people that he was a "brave little four-foot thunderball". "I've only realised how tough it is as I've got older," he says.

The early loss of his father had another effect: Martin knows "embarrassingly little" about his dad's side of the family. To fill in the gaps, Martin begins by researching the life of his grandfather, Leonard.

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In each episode one of Britain's best-loved celebrities traces their family tree to reveal the surprising, extraordinary and often moving stories of their ancestors.

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