Prison – Prisoner. The claimant, a prisoner serving an indefinite sentence for the protection of the public, sought judicial review of the lawfulness of a prison service instruction (the PSI), in particular, the restrictions on prisoners' receipt or use of books. The Administrative Court, in allowing the application, held that there was no good reason, in the light of the importance of books to prisoners, to restrict possession beyond what was required by volumetric control and reasonable measures relating to the frequency of parcels and security considerations. Accordingly, insofar as it included books in the Incentives and Earned Privileges Scheme, the PSI was unlawful.