s 172 Additional power of persons appointed as a result of section 168(1) , (4) or (4B) .
(1) An investigator has the powers conferred by section 171. (2) An investigator may also require a person who is neither the subject of the investigation (“ the person under investigation ”) nor a person connected with the person under investigation— (a) to attend before the investigator at a specified time and place and answer questions; or (b) otherwise to provide such information as the investigator may require for the purposes of the investigation. (3) A requirement may only be imposed under subsection (2) if the investigator is satisfied that the requirement is necessary or expedient for the purposes of the investigation. (4) “ Investigator ” means a person appointed as a result of subsection (1) , (4) or (4B) of section 168. (5) “ Specified ” means specified in a notice in writing.