Returning: GrantchesterEleventh and final season with Rishi Nair and Robson Greene screens ahead of its British premiere. The 11th and final season of Grantchester has its Australian premiere on ABC tomorrow night. Series creator, writer and executive producer Daisy Coulam said in a statement: “At its heart, Grantchester is a show about the power of friendship and love. Thank you to the lovely people of real Grantchester. Rishi Nair said: “It’s been the greatest honour to step into the world of Grantchester and be part of a show with so much heart.