Happy Valley diehard fans will be kicking themselves after creator Sally Wainwright pointed out an easter egg in her new show Riot Women that was totally missed by viewers.Riot Women is the Yorkshire writer and director’s latest TV drama, with the critically acclaimed series following a group of midlife women who come together to form a punk rock band and starring the likes of Joanna Scanlan, Tamsin Greig and Sue Johnston.However it was Taj Atwal’s character of Nisha Lal who gave an on-screen nod to Sarah Lancaster’s beloved Happy Valley character Catherine Cawood. With both Nisha and Catherine being in the police force, Sally decided to pay homage to Catherine Cawood by handing her collar number over to Nisha in Riot Women.Sally shared a side-by-side picture of both police officers and joked that it was her own versio