21.—(1) If the Secretary of State considers that further information is required to determine an application, the Secretary of State may serve a notice on the applicant specifying the further information and the period within which it must be provided.
(2) If the applicant fails to provide the further information in accordance with that notice, the Secretary of State may serve a further notice on the applicant stating that the application is considered to be withdrawn.
(3) If an application is considered to be withdrawn, the applicant is not entitled to the return of any fee which accompanied it.