Has reporter Sian Reese-Williams uncovered the truth about Llŷr’s death? Plus Jack Thorne-penned Enola Holmes returns. Here’s what to watch this evening
9pm, Channel 4
As the second season of this gloomily gripping Welsh drama concludes, the tone is more elegy than explosion as the events around the controversial reservoir expansion continue to unfold. Budding journalist Caryl Huws (Siân Reese-Williams) is probing Llŷr’s demise but this puts her on a collision course with Robert (Robert Glenister), who wants the past to remain undisturbed. It has been a bleak study in small town ennui. Phil Harrison