In 1992, it began also housing adult prisoners when the building of a perimeter fence made it a closed establishment.

Guys Marsh soon became an all-adult prison, and within 18 months the gaol managed to increase its operating capacity by 278.

The Board also expressed concern over medical care, after a local GPs practice withdrew its services from the prison.

A Visitor Centre is available at the prison, with facilities including toilets and a baby changing room.

Peter Clarke, the chief inspector, said the 2014 inspection found the prison in crisis “where managers and staff had all but lost control”.