23.—(1) If no appeal is brought under Article 22 against a notice of unfitness or notice of disrepair, the notice shall become operative on the expiration of 21 days from the date of service of the notice.
(2) Any notice against which an appeal is brought shall, if and so far as it is confirmed by the county court or the Court of Appeal, become operative as from the date of the final determination of the appeal.
(3) For the purposes of this Article, an appeal shall be deemed to be finally determined on the date on which the decision of the Court of Appeal is given, or, in a case where an appeal from the county court is not brought to the Court of Appeal, upon the expiration of the period within which such an appeal might have been brought.
(4) For the purposes of this Article, the abandonment of an appeal shall be deemed to be a final determination thereof, having the like effect as a decision confirming the notice, order or decision against which the appeal was brought.
(5) No steps shall be taken by the appropriate district council to enforce a notice of unfitness or notice of disrepair before the notice becomes operative.