647Appellable decisions

647 Appellable decisions (1) A person may appeal to the relevant appeal body against a review decision relating to a reviewable decision made by the Regulator or an authorised officer. (2) A person may appeal against the review decision only within 28 days after— (a) if a review notice is given to the person under section 646—the notice was given to the person; or (b) if the reviewer is taken to have confirmed the decision under section 646(3)—the period mentioned in that section ends. (3) However, the relevant appeal body may extend the period for appealing. (4) The filing of an appeal does not affect the review decision, or the carrying out of the review decision, unless it is stayed under section 648.