Porridge - Season 1 Episode 5 -

For punishment Fletch is sewing fishing nets with McLaren,an aggressive prisoner disliked by staff and inmates both. Fletch has a plan to turn him from zero to hero,involving their going up onto the roof,where McLaren will rescue Fletch and be seen as a hero. The plan works - sort of,whilst Fletch shows Ives an obscene publication he says he found in the governor's office.