Crimewatch is celebrating 30 years helping the police solve crimes. The BBC series has featured more than 4,000 cases with one in three ending in arrest and one in five in convictions. Here are some of its most high-profile cases.
In 1993 Crimewatch showed footage of two boys holding the toddler’s hands. Jon Venables and Robert Thompson, both 10, were identified and convicted of his abduction and murder as a result.