Call The Midwife creator Heidi Thomas has teased the upcoming prequel spin-off series, confirming the three lead characters. The beloved BBC period drama, which first aired in 2012 and is currently on its 15th season, was rumoured to be coming to an end soon, though the BBC was forced to shut down the claims . A cinema-release movie and a prequel series , as well as a 16th season, are all expected, with the broadcaster previously confirming: “The BBC would like to reassure fans that Call The