21.—(1) Any irregularity resulting from failure to comply with any provision of these Regulations before the Tribunal has reached its decision shall not of itself render the proceedings void.
(2) Where any such irregularity comes to the attention of the Tribunal before it has reached its decision, the Tribunal may, and shall if it considers that any person may have been prejudiced, take such steps as it thinks fit before reaching its decision to cure the irregularity.
(3) Clerical mistakes in any document recording a decision of the chairman or Tribunal, or errors arising in such a document from an accidental slip or omission, may be corrected by the chairman by certificate under his hand.