“In the Long Run,” a sweetly comic series set in 1980s London, is based on the real-life childhood of an actor best known for intense dramas like “The Wire” and “Mandela: Long Walk to Freedom.”“In the Long Run,” a sweetly comic series set in 1980s London, is based on the real-life childhood of an actor best known for intense dramas like “The Wire” and “Mandela: Long Walk to Freedom.”Read MoreTelevision, Elba, Idris, In the Long Run (TV Program), Starz, Sky One