5.—(1) Notice of appeal must be given—
(a)in the case of an appeal under section 43, before the expiry of the period of 6 months beginning with—
(i)the date of the decision which is the subject of the appeal; or
(ii)the date on which the waste regulation authority is deemed by section 36(9), 37(6), 39(10) or 40(6) to have rejected the application;
(b)in the case of an appeal under section 66(5), before the expiry of the period of 21 days beginning with the date on which the determination which is the subject of the appeal is notified to the person concerned.
(2) The Scottish Ministers may, in relation to an appeal under section 43, at any time allow notice of appeal to be given after the expiry of the period mentioned in paragraph (1)(a).