Channel 4 drama It’s A Sin, discussing plot lines and revealing that it was originally pitched to cover eight episodes.Speaking on Damian Barr’s Literary Salon, the screenwriter said an additional flatmate and further story arcs were lined up had the show been allowed to run for longer.“It could’ve been eight episodes long, and there would’ve been an extra flatmate, and he would’ve had adventures,” he said in the interview. “But I was offered four episodes, and that’s fine.