David Tennant gives a shockingly convincing performance as the real-life Scottish serial killer Dennis Nilsen, who was arrested in 1983 when a drain blockage led to the discovery of his victims’ remains. Three-parter Des is one of the very best of the recent bunch. In fact, the channel’s primetime schedules seem to be filled with nothing but the tales of murderous villains and the coppers charged with hunting them down. Des, episode two Photograph: ITV/Rex/Shutterstock
