The Murder of Becky Watts: The Police Tapes ' - a new documentary hosted by Susanna Reid airing on ITV tonight at 9pm - looks into how the detectives investigating the disappearance of Becky Watts ...

When 16yearold Becky Watts went missing in 2015 it sparked a major police investigation to find the teenager But only two people knew where she was her stepbrother Nathan and his girlfriend Shauna ...