16 an injuria for which the Aquilian action lies if it has directly resulted in loss. (See Young ,1922 A.D. 492 at 507; Matthews and Others v Geary & Son (Pty) Ltd v. Gove 1964(1) SA 434 (A) at 440-441 In order to succeed in an action based on unfair competition, the plaintiff must establish all the requi¬ sites of Aquilian liability, including proof that the de¬ fendant has committed a wrongful, act. In such a case, the unlawfulness which is a requisite of Aquilian liability may fall into a category of clearly recognized illegality, as in the illustrations given by CORBETT J in Dun and Bradstreet (Pty) Ltd v S.A. Merchants Combined Credit Bureau(Cape)(Pty)Ltd .1968 (1) SA 209 (C) at 216 F-H, namely,trading in contravention of.....