<Li> Amer Nazir as Twiggy: a Police Constable . </Li> <Li> Rachel Leskovac as Julie: Ashley's wife . </Li> <Li> Alan McKenna as Phil Crabtree: a Detective Inspector (DI) with the National Crime Agency . </Li> <Li> Caroline O'Neill as Lynn Dewhurst, Tommy Lee Royce's mother . She becomes the subject of a murder investigation in Series 2 . </Li>

Who plays sarah lancashire's sister in happy valley