As The Shawshank Redemption turns 30, Ellen E Jones and Mark Kermode explore life behind bars as seen on screen, investigating how film and TV have shaped our ideas about the prison system. Why do prisons make such good settings for cinema?

Ellen investigates the relationship between prison exploitation and prison reform, talking to director S Craig Zahler about his ultra-violent 2017 film Brawl In Cell Block 99 and the movies that inspired it, from Birdman of Alcatraz to Riot in Cell Block 11. And she speaks to Dr Kalima Young about the impact of Netflix's hit series about a women's prison, Orange Is The New Black.

Meanwhile, Mark talks to writer and broadcast Richard Weight about the enduring relevance of the classic British sitcom Porridge. And he speaks to 'the daddy' of prison dramas - Ray Winstone - about the impact of his breakout role as a borstal boy in the controversial, banned TV play Scum.

Producer: Jane Long
A Prospect Street production for BBC Radio 4