Regulation 17 Prescribed procedures
A failure to comply with any of the requirements of regulation 16(1) to any extent will only invalidate an application if:
the applicant does not provide, when making the application, an explanation for the failure which the Secretary of State considers to be satisfactory,
the Secretary of State notifies the applicant, or the person who appears to the Secretary of State to represent the applicant, of the failure within 28 days of the date on which the application is made, and
the applicant does not comply with the requirements within a reasonable time, and in any event within 28 days, of being notified by the Secretary of State of the failure.
For the purposes of this regulation, the date on which the application is made is:
in the case of an application sent by post, the date of posting,
in the case of an application submitted in person, the date on which the application is delivered to, and accepted by, a public enquiry office, and
in the case of an application sent by courier, the date on which the application is delivered to Work Permits (UK) at the Border and Immigration Agency of the Home Office.