Chris Lewis Security has installed an access control system at Oxford Castle.

The building was formerly a prison, and closed its gates in 1996. It has been used as a place of incarceration since 1971.

Chris Lewis said: "Our access control system ensures the building is secure at all times when it is not open to the public.

“The sophisticated system also provides authorised staff with incredible functionality.

“It enables them to monitor and control movement across the buildings and control times when doors are locked."