138.—(1) When notice is given of a meeting to be held in postal administration proceedings, and forms of proxy are sent out with the notice, no form so sent out shall have inserted in it the name or description of any person.
(2) No form of proxy shall be used at any meeting except that which is sent out with the notice summoning the meeting, or a substantially similar form.
(3) A form of proxy shall be authenticated by the principal, or by some person authorised by the principal (either generally or with reference to a particular meeting). If the form is authenticated by a person other than the principal, the nature of the person’s authority shall be stated.