OTU X AND OTHERS v. OWUODZI AND OTHERS Practice and procedure—Review—Judicial committee of National House of Chiefs—Review jurisdiction inherent in adjudicating tribunal—Jurisdiction to be invoked by tribunal where judgment void and by parties where merely voidable—Principles guiding exercise of power of review by judicial committee—High Court (Civil Procedure) Rules, 1954 (L.N. 140A), Order 39—Chieftaincy (National and Regional Houses of Chiefs) Procedure Rules, 1972 (C.I. 27), r. 28.