(1) Every individual and firm required by this Act to be registered shall, in all trade catalogues, trade circulars, showcards, and business letters, on or in which the business name appears and which are issued or sent by the individual or firm to any person in any Commonwealth country, have mentioned in legible characters—
-
(a) in the case of an individual, his or her present christian name or the initials, and present surname, any former christian name or surname, his or her nationality if not British; and
-
(b) in the case of a firm, the present christian names or the initials thereof and present surnames, any former christian names and surnames, and the nationality if not British, of all the partners in the firm, or in the case of a corporation being a partner, the corporate name.