Questions relating to interpretation of rules or regulations
75.4. Where a question of the interpretation of any of the rules or regulations referred to in section 61(1)(a) of the Act of 1986 arises in a petition under this rule, the Secretary of State, a designated agency, or any person referred to in section 61(1)(a)(iv) of that Act, and not already a party in the cause, shall be given the opportunity to make representations to the court by lodging answers to the petition.