3. SEPA may, by notice in writing (or in electronic form) to the applicant, require the applicant to furnish such further information specified in the notice, within the period so specified, as it may require for the purpose of determining the application and where the applicant fails to furnish the specified information within the period specified, the application shall, if SEPA gives notice to the operator that it treats the failure as such, be deemed to have been withdrawn at the end of that period.