(1) Where a person retains possession of documents and gives to another person in writing -

(a) an acknowledgment of the right of that other to production of those documents and to delivery of copies of them ("the acknowledgment"),

(b) an undertaking for the safe custody of those documents ("the undertaking"),

the acknowledgment and the undertaking have the effect specified in this section.

(2) The obligations imposed by an acknowledgment are to -

(a) produce the documents or any of them at all reasonable times for the purpose of inspection and of comparison with abstracts or copies of the documents, by the person entitled to request production or by any person authorised in writing by that person,

(b) produce the documents or any of them in court or any other place where, or on any occasion when, production may properly be required for proving or supporting the title or claim of the person entitled to request production, or for any other purpose relating to that title or claim,

(c) deliver to the person entitled to request them such copies or abstracts, attested or unattested, of or from the documents or any of them.

(3) The obligation imposed by an undertaking is to keep the documents complete, safe, uncancelled and undefaced.

(4) The obligations shall be performed from time to time -