156.—(1) In this Chapter “appropriate Minister” means—

(a) where the duties of a particular employment or employments of a particular class, description or grade relate wholly or mainly to the functions of a Minister of the Government other than the Minister, such Minister of the Government,

(b) in all other cases, the Minister.

(2) If any question or dispute arises as to whether the duties of a particular employment or employments of a particular class, description or grade relate wholly or mainly to the functions of a Minister of the Government other than the Minister, the matter shall be referred to the Minister for determination and the decision of the Minister shall be final.

(3) The appropriate Minister, may amend or revoke any declaration made or deemed to have been made or any direction given by him or her under this Chapter.