REPUBLIC v. HIGH COURT, ACCRA; EX PARTE QUARCOO Practice and procedure—Concurrent proceedings before Supreme and High Courts—Election—Substantive suit between parties before High Court—Application at Supreme Court for certiorari to quash ruling of High Court in action—Both proceedings pursued concurrently—Whether permissible—Party to discontinue one proceeding or suffer sanctions—High Court (Civil Procedure) Rules, 1954 (L.N. 140A), Order 5, r. 3.