"It would be a bizarre and unsatisfactory result if, the less able the Applicant is to satisfy the full requirements for entry clearance, the more readily he should be excused the need to apply…… True it is that "the protection of human rights is not a reward for virtue and the with holding or dilution of them is not a penalty for vice," but that is not to say that a person's immigration history is any relevant consideration when striking the balance between his Article 8 rights and countervailing public interest in maintaining effective immigration control."