18.—(1) The Department may, by notice in writing to the applicant, request such additional information in relation to any application under regulation 8, 13(1)(b), 14(2) or 15(3) as it reasonably requires.
(2) The Department may request such additional information within such period as it may specify or agree with the applicant in writing.
(3) Where an applicant fails to provide the Department with any information requested under paragraph (1) the Department may refuse to proceed with the application to which it relates or refuse to proceed with it until the information is provided.