Four Lives BBC1, 9pm

The Grindr serial killer drama reaches its conclusion. The body of a fourth man, Jack Taylor, is found in a Barking churchyard and the victims’ families demand answers. Although Stephen Port (Stephen Merchant) is arrested, securing a guilty conviction for all four of the murders looks far from certain. Meanwhile, Sarah Sak (Sheridan Smith) accepts she will never know what really happened to Anthony. ★★★★☆