98According to the applicant, the concept of legitimate expectations constitutes an important corollary to the principle of legal certainty and requires that those who act in good faith on the basis of the law as it is or seems to be should not be frustrated in their expectations. The case-law confirms that a mere administrative practice or concession that is not contrary to the legislation in force and does not involve the exercise of discretion may give rise to a legitimate expectation on the part of the persons concerned, and that the expectation does not necessarily have to be founded on a communication which is generally applicable (Case 84/85United Kingdom v Commission [1987] ECR 3765; order in Case C-152/88 R Sofrimport v Commission [1988] ECR 2931; and Case T-310/00MCI v Commission [2004] ECR II-3253, paragraph 112).