11.—(1) Any person to whom benefits are payable under these regulations shall furnish all such information as the new authority may at any time require; and he shall verify that information in such manner, including the production of documents in his possession or control, as may be reasonably so required.
(2) Such a person to whom benefits are payable under these regulations shall, on receipt of reasonable notice, present himself for interview at any place that the new authority may reasonably require; and any person who attends for interview may, if he so desires, be represented by his adviser.
(3) Where in accordance with regulation 14(1) any requirement under this regulation is made by an employing authority, the person of whom the requirement is made shall furnish or verify the information or, as the case may be, present himself for interview, as required by the employing authority.