Paragraph 12

The failure of any person (other than the appellant in serving notice of appeal on the Secretary of State within the time prescribed in paragraph 4 above) to serve any notice, submission or reply, or copies thereof or to furnish any particulars in the time provided for in this Schedule or any other procedural irregularity shall not invalidate the decision of the Secretary of State; and the Secretary of State may, and shall if he considers that any person may have been prejudiced, take such steps as he thinks fit before deciding the appeal to cure the irregularity.