Trinidad and Tobago – Constitutional Law. The applicant police constable sat an exam for promotion to the rank of sergeant. He was told that he had passed the exam, but he was not promoted. He sought to persuade the respondent Police Service Commission of Trinidad and Tobago that he should be exempted from being required to take an exam for promotion to the rank of corporal. The Privy Council, in dismissing the applicant's application for judicial review, held that to allow the application would run counter to the basic structure of the promotion scheme.