11. In the second place, leaving historical considerations aside, there may well be a sensible explanation of the presence, as a separate provision, of par.(b). That paragraph does not confine it subject matter to a matter which is within the jurisdiction of the Commission. It is not limited to decisions upon industrial matters. It deals, so far as is relevant to the present case, with any award, order, proceeding, or direction of the Commission "relating to any industrial matter . . . or any other matter which, on the face of the proceedings, appears to be or to relate to an industrial matter . . . ". Furthermore, it is not content to rest its injunction on the formula of the traditional privative clause. It says bluntly "No writ of prohibition or certiorari shall lie . . . ". It seems to us, on a consideration of the two paragraphs of s.84 (1), that the legislative scheme is to distinguish between industrial matters and other matters within the jurisdiction of the Commission, and to take unusual steps to protect the Commission from judicial review of awards, orders or proceedings in relation to industrial matters while allowing the usual doctrine with respect to privative clauses to apply to the latter. Thus even excess of jurisdiction in relation to industrial matters may not suffice to attract the prerogative writs. It will not do so if it is a matter which, on the face of the proceedings, nevertheless appears to be or to relate to an industrial matter. It may be that the elucidation of established doctrine which is contained, for example, in R. v. Hickman; Ex parte Fox [1945] HCA 53; (1945) 70 CLR 598, at p 615 , has brought the two paragraphs closer together in their operation and effect, but that does not deny the reality of the legislative scheme as we have discerned it. That scheme found expression in its present form as long ago as 1912, shortly after the decision of this Court in Baxter v. New South Wales Clickers' Association [1909] HCA 90; (1909) 10 CLR 114 . (at p95)