Question to the Ministry of Justice:

To ask Her Majesty's Government what plans they have to reduce the number of prisons operating at over 150 per cent of their capacity.

There are no prisons operating over their operational capacity in England and Wales. The operational capacity of a prison is the total number of prisoners that an establishment can hold taking into account control, security and the proper operation of the planned regime. It is determined by the prison group directors on the basis of operational judgement and experience.

Certified Normal Accommodation (CNA), or uncrowded capacity, is the Prison Service’s own measure of accommodation. CNA represents the good, decent standard of accommodation that the Service aspires to provide all prisoners. CNA differs to the operational capacity of a prison which is the total number of prisoners that an establishment can hold taking into account control, security and the proper operation of the planned regime. It is determined by the Prison Group Directors on the basis of operational judgement and experience.

Where the operational capacity of a prison is higher than the CNA it will be classed as having the potential to be 'crowded', which can mean prisoners share cells. In the financial year 2017-18, 24.2% of the prison population was being held in crowded conditions, down from 24.5% in the previous year.

As part of prison reform, the long-term goal is to reduce crowding, while maintaining sufficient capacity in the prison estate to manage the demands of the courts and the sentenced population as efficiently as possible. This level is kept under constant review, considering fluctuations in the prison population and useable capacity across the estate.