19. If any directions given to a party under this Part of these Regulations are not complied with by that party, the Tribunal may, before or at the hearing, dismiss the whole or part of the appeal or, as the case may be, strike out the whole or part of the Chief Inspector’s reply and, where appropriate, direct that the Chief Inspector shall be debarred from contesting the appeal altogether:
Provided that the Tribunal shall not so dismiss or strike out or give such a direction unless it has sent notice to the party who has not complied with the direction giving him an opportunity within a period of not less than twenty–one days to explain why it should not do so.