The notification stage for an application to which the notification stage applies ends—
(a) if the applicant gives a declaration under section 158 (1) within the period mentioned in section 158 (2) —when the administering authority receives the declaration; or
(b) if paragraph (a) does not apply and the administering authority decides under section 159 (2) to allow the application to proceed—when notice of the decision is given under section 159 (4) .