Evidence shows that prisons are full and custodial sentences aren't working. But what's really going on in one of society's most invisible institutions? Sky's Sophy Ridge goes inside Preston prison to get a real sense of what is going on in the UK's prisons. #prisons #shadowjusticesecretary #commons SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on

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