(i) An undertaking or association of undertakings the subject of a decision under section 15X (including a decision on the basis of which an Article 16(1) periodic penalty payment is imposed), other than section 15X(8), may appeal to the Court against that decision not later than 28 working days after the undertaking or association of undertakings receives notice of such decision under section 15Y.
(ii) An undertaking or association of undertakings the subject of an order on consent under section 15X(8) may appeal to the Court against that decision not later than 12 working days after the undertaking or association of undertakings receives notice of such decision under section 15Y.
(iii) A decision of an adjudication officer under section 15X shall not be questioned, including as to its validity, other than by way of an appeal under this section, and no proceedings questioning such a decision (including an application for judicial review referred to in section 15AAA or otherwis
…