Letters and other facilities for defence

(1) An untried prisoner shall be allowed all reasonable facilities, including the provision of writing materials, for communication by letter with his friends or for conducting correspondence or preparing notes in connection with his (2) A confidential written communication for the legal adviser of an untried prisoner may be delivered personally to such legal adviser, and shall not be treated as a letter to which paragraph (3) of Rule 87 of these Rules applies, unless the Superintendent has reason to suppose that it contains matter not relating to such instruction.