A total of 39 new prisons, including the prison ship the Weare which has since closed, have opened since 1979.
A number of these were built on sites either directly acquired from the Ministry of Defence (MOD), or acquired from a third partly but which previously belonged to the MOD.
A detailed investigation of the site records is necessary to determine their precise origin. I will write to the hon. and learned Member as soon as this investigation is complete.