REPUBLIC v. EASTERN REGIONAL HOUSE OF CHIEFS; EX PARTE BIRIKORAMAA AND ANOTHER State proceedings—Certiorari—Decision of judicial committee of regional house of chiefs— Error on face of record—Appeal from decision of Akim Abuakwa Traditional Council (A.A.T.C.) in chieftaincy dispute allowed by Eastern Regional House of Chiefs (E.R.H.C.)—E.R.H.C. only tribunal competent to hear appeals from A.A.T.C.—Whether certiorari available for any mistake of law made by E.R.H.C. whilst hearing appeal from A.A.T.C.