"Before making an order under sub-paragraph (d) of Rule 13 (2) [which includes an order striking-out a notice of appearance] the tribunal shall send notice to the party against whom it is proposed that the order should be made giving him an opportunity to show cause why the order should not be made …"
"… but this paragraph shall not be taken to require the tribunal to send such notice to that party if the party has been given an opportunity to show cause orally why the order should not be made."