The prisoner helping to control other inmates

Could allowing inmates greater freedoms in prison, and engaging them in mentoring schemes, be a key tool in rehabilitation?

Ben has been in HMP Oakwood for five years, and has taken on the role of a mentor - helping officers control tensions.

The prison has been labelled "impressive" by inspectors.

Watch the BBC's Victoria Derbyshire programme on weekdays between 09:00 and 11:00 BST on BBC Two and the BBC News Channel in the UK and on iPlayer afterwards.