HM Prison Wandsworth is a prison in Wandsworth in south London, England. It was built in 1851 when it was known as the Surrey House of Correction. It was designed according to the humane Panopticon principle with a number of corridors radiating from a central control point and each prisoner having toilet facilities. Subsequently, the toilets were removed to increase prison capacity and the prisoners had to engage in the humiliating process of ‘slopping-out’ until 1996. Wandsworth contains two wings.