BAIDEN v. GHANA NATIONAL TRADING CORPORATION Practice and procedure—Judgment or order—Review—Mistake or error apparent on the face of the record—Judgment based on letter found by court to have been received by applicant—Letter in fact never received—Whether mistake or error providing ground for review of judgment—High Court (Civil Procedure) Rules, 1954 (L.N. 140A), Order 39, r. 1.