Article 16 Summoning of witnesses
Subject to paragraphs (2), (3) and (4) below, the Tribunal may by summons or, where the Tribunal is sitting in Scotland, citation require any person in the United Kingdom—
to attend as a witness at a hearing at such time and place as may be specified in the summons or citation and, subject to the proviso to rule 13(1) above, at the hearing to answer any questions; or
to produce any documents or other material in his custody or under his control which relate to any matter in question in the appeal, whether at the hearing or at an earlier time.
No person shall be required to attend in obedience to such a summons or citation unless he has been given at least 5 days’ notice of the hearing date or, if less than 5 days, he has informed the Secretary that he accepts as sufficient such notice as he has been given.
No person shall be required in obedience to such a summons or citation to attend and give evidence or to produce any document unless the necessary expenses of such attendance or production are paid or tendered to him.
The Tribunal shall make such provision as it thinks necessary to supply copies of any document obtained under this rule to the parties, and it shall be a condition of such supply that a party shall use such a document only for the purposes of the appeal.
Any expenses to which a person is entitled under paragraph (3) above shall be paid by the Secretary of State.