In a broadcasting first, the BBC has followed a team from His Majesty’s Inspectorate of Prisons as it investigates conditions in a prison near Rugby in Warwickshire.

This portrait of a prison on trial reveals how under-resourced prison staff are failing to stop copious amounts of drugs being brought in, and are struggling to provide a safe and productive environment in which prisoners can be prepared for release back into society.

His Majesty’s Prison Onley is a category C, medium security prison, housing 740 inmates. Its governor, Mark Allen, says Onley is among the top ten prisons for incursion of drugs via drones and admits many of his staff are too inexperienced to handle the inmates, resulting in frustration among prisoners, and violence.

In its last inspection three years ago, Onley was found to be struggling in various areas, and it doesn’t take the inspection team long to find out that things are, if anything, getting worse.

Inspectors meet prisoners who complain about everything from lack of laundry facilities to failure to provide meaningful work opportunities, or help with their offender behaviour.

One inspector has to intervene when she finds a prisoner ‘spiced up’ and in need of immediate help. Another prisoner is refusing to leave the relative safety of the segregation wing, because he’s being threatened with violence over his debts to drug dealers within the prison. Inspectors discover evidence that officers are too ready to resort to force to deal with difficult prisoners and failing to keep accurate records of their restraining methods.

Prison officers talk about the challenges of trying to deal with violence within the prison and of trying to prevent drugs coming in.

In a lighter moment, lead inspector Angus Jones visits the prison library and discovers a surprising inclusion among books the prisoners are not allowed to read.

The inspection ends with the team meeting to agree how to score Onley against their key criteria for a ‘healthy prison’ and then presenting their conclusions to the Governor.

Presenter: Rex Bloomstein

A Whistledown production for BBC Radio 4.