Elizabeth Yardley

The smiling parents, the respectable groom, the helpful official... all with evil inside. Britain's Most Evil Killers explores the crimes of Britain's most brutal killers.

The story behind the murder of 16-year-old Becky Watts, who was killed by her stepbrother Nathan Matthews and his 21-year-old partner Shauna Hoare in Bristol in February 2015. This programme documents the huge police manhunt that unfolded in the wake of her disappearance, and the police investigation which eventually brought her murderous stepbrother to justice.

25 years after he first reported on it, Sir Trevor re-visits the case of Beverley Allitt, one of Britain's most prolific serial killers.

In March 2011, four adults who lived in a cul-de-sac in the Welsh town of Kidwelly were convicted of multiple sex offences against children and young adults. The group led by Colin Batley was described by the media as a "Satanic sex cult", a "quasi-religious sex cult" and a "paedophile cult." Episode from crime-series "Nightmare in Suburbia".