HC Deb 22 June 1984 vol 62 c299W
Sir John Farr

asked the Secretary of State for the Home Department what is the present policy in relation to the locking of all post boxes used by prisoners for posting their mail in Her Majesty's prisons.

Mr. Hurd

It is general practice to lock boxes used by inmates to deposit outgoing letters for collection by staff in order to prevent other inmates from reading or interfering with correspondence, unless the box is located in an area to which inmates do not have unsupervised access.