Sid Owen off EastEnders is first in. Stripped of home comforts, Sid takes drastic action. And MP Johnny Mercer meets a convicted contract killer who used to 'run people over'.

Ex-Tory MP Neil Parish and pop star HRVY step through the doors of HMP Shrewsbury to sample life on the inside. Between them they endure a series of pranks and a hostage crisis.

Mail on Sunday columnist Peter Hitchens sparks fireworks at the prison's drug support group. Actor Tom Rosenthal smuggles contraband into the prison stashed intimately deep 'inside' his body.

HMP Shrewsbury's at boiling point. Staff struggle as inmates run amok. The VIPs scramble to survive as the experiment comes to an end and they reflect on their time inside.