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A documentary promising to lift the lid on prison life hardly counts as groundbreaking TV, yet Ross Kemp battles manfully to find a new angle in this film about infamous Scottish jail HMP Barlinnie.

The former soap star wants to know if the British prison system is working well and is soon able to provide a predictable answer to that question, yet the strongest moments arrive when inmates and prison officers share their stories.

Prepare for some eye-watering tales of violence, a distressing chat with a sex offender and some ingenious methods of smuggling drugs past the guards.