he two writers, Sharon Horgan and Holly Walsh met through Jo Caulfield, a stand-up comedian who had a show on Radio 4. Horgan and Walsh both worked on the show, Horgan as an actress, and Walsh as a writer. Horgan initially had the idea of writing a sitcom based on somebody being stuck in prison for a crime they didn't commit. She asked Walsh if she wanted to work on it with her and the process from conception to broadcast took over two and a half years