The Pembrokeshire Murders 9pm, ITV Luke Evans stars in this harrowing three-parter telling the true story of serial killer John Cooper’s eventual conviction in 2011 for historic murders, owing to pioneering DNA evidence. In tonight’s opener, Det Supt Steve Wilkins (Evans) returns to Pembrokeshire and is stunned to discover a number of unsolved murders on the books – with the prime suspect being local burglar Cooper (Keith Allen). Wilkins rushes to gather enough evidence to convict before Cooper is released on parole. Continues nightly until Wednesday. Ammar Kalia 5pm, Channel 4 The former Great British Bake off contestant Liam Charles returns to judge the latest series of the bitesize Bake Off competition, with new addition pastry chef Ravneet Gill and co-hosting duties by the enthusiastic Harry Hill. Eight hopefuls enter the tent, tasked with making a sponge and jelly concoction, as well as a fantasy cake themed around their wildest dreams.