DOCUMENTARY

The Nilsen Files BBC2, 9pm

Hot on the heels of the excellent, if short, series about Scottish murderer Bible John comes another disturbing but gripping true-life crime documentary. However, despite its title, the three-parter doesn’t focus primarily on serial killer Dennis Nilsen (above), but rather the young men and boys who were his victims. It also asks awkward questions about why their disappearances were initially overlooked. ★★★☆☆