A prisoner serving a sentence of preventive detention is not eligible for release on licence when two-thirds of the sentence have been served unless he has been admitted to the third stage of the sentence. Admission to the third stage is decided by an advisory board, which sits at Parkhurst and is not assisted or controlled by any other body in London.
The prison rules provide that the advisory board shall consist of three members of the prison's Board of Visitors approved by the Secretary of State, and such other persons not exceeding four as the Secretary of State may appoint; and that the chairman shall be appointed by the Secretary of State.
The Chairman is Mr. Bertram Reece, a Metropolitan magistrate. The members representing the Board of Visitors are Lieut.-Colonel C. W. Brannon, Mr. G. C. Russell, and Lieut.-Colonel F. C. R. Britten. The other members are Mr. Duncan Fairn, Director of Prison Administration; Mr. J. C. V. Lovatt, a principal probation officer; and Captain R. C. Williams, a retired prison commissioner.
The Board is assisted by the Director of the Men's Section of the Central After-Care Association, and has before it all the information about the prisoner that is available in his record and also special reports by the prison governor and his principal subordinates, the medical officer and the chaplain or prison minister.
The number of prisoners who have been released after serving two-thirds of the sentence is 36; the number who were eligible for admission to the third stage but were not selected for it is 207.