Mark Williams-Thomas carries out the first active British investigation into Christian B.

Marking the 25th anniversary of the tragic car crash that killed her, this new ground-breaking documentary will examine the death of Diana, Princess of Wales. Twenty five years on, many questions around what happened, and who is responsible, still remain. Featuring exclusive never before heard interviews, former Detective and award-winning Investigative Journalist Mark Williams-Thomas, will examine some of the theories that have emerged since Diana’s death and will set out to answer key questions: Could Diana have actually survived the crash if she had been treated differently at the scene? And what impact did Diana’s explosive BBC interview have on the final years of her life? Did it set off a chain of events that actually led to her death?

A rare insight into the workings of the high-security psychiatric hospital, Broadmoor, with testimony from those who have come face to face with Britain’s most notorious killers. Broadmoor Hospital is home to around 200 of Britain’s most dangerous men, and this documentary offers a glimpse of what life is like behind bars for some of its most famous inhabitants, including Peter Sutcliffe and Robert Maudsley.

Former detective Mark Williams-Thomas conducts an in-depth investigation into allegations that Sir Jimmy Savile sexually abused vulnerable teenage girls at the height of his fame.

After ITV released their documentary “The Other Side of Jimmy Savile“, they received a huge response which lead to more people coming forward with stories of abuse committed by Savile. This lead to a new documentary being released almost two months later in which Mark Williams-Thomas gets in touch with some of these people that came forward and tracks the progress of the current police investigation into these claims of sexual abuse.

In 1973, Michael and Patrick McDonagh were sentenced to life in prison for a murder they didn't commit. In Mark Williams-Thomas' latest investigation, he examines the evidence, speaks to witnesses, and unearths a conspiracy to the course of justice.

Following the unique experience of an elderly couple accused of murdering their son, Steven Clark. Steven disappeared in mysterious circumstances while on a walk with his family in 1992. Decades later, his parents Doris and Charles were arrested on suspicion of murder following a cold case review.

Using exclusive interviews, this film tells the story of the 2002 double murder of two girls in Soham, Cambridgeshire, England in unflinching detail.

Jimmy Savile appeared to be untouchable, why? This movie shows how celebrity and fame masked crimes in plain sight. Shaun Attwood interviews guests to reveal how Savile hid his crimes for almost 50 years