4. If within—N.I.
(a)two months after an application has been made to a district council; or
(b)such longer period as may be agreed upon in writing by that council and the person who made the application;
the council have not given notice under paragraph 3 that the application has been granted (whether unconditionally or subject to conditions) or, as the case may be, refused, the application shall be deemed to have been refused.