HMP Oakwood: 'Britain's worst prison'

As prisoners take to the roof of HMP Oakwood in protest, Mark Gettleson from the Howard League for Penal Reform says it must be 'Britain's worst prison'.

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Rooftop protest at Oakwood

A rooftop protest has been held at the heavily criticised HMP Oakwood near Wolverhampton - for the second time in a matter of weeks.