11. For rule 16(4) (summoning or citation of witnesses and orders to answer questions or produce documents) substitute—
“(4) A person who receives a summons, citation or order may apply to the Upper Tribunal for it to be varied or set aside if they did not have an opportunity to object to it before it was made or issued.
(5) A person making an application under paragraph (4) must do so as soon as reasonably practicable after receiving notice of the summons, citation or order.
(6) A summons, citation or order under this rule must—
(a)state that the person on whom the requirement is imposed may apply to the Upper Tribunal to vary or set aside the summons, citation or order, if they did not have an opportunity to object to it before it was made or issued; and
(b)state the consequences of failure to comply with the summons, citation or order.”.