Where an inspector appointed under Regulation 166 to investigate the affairs of an investment firm or the market operator of a regulated market or any subsidiary or other associated or related undertaking thinks it necessary for the purposes of the investigation to investigate the affairs of -
(a) any other investment firm or market operator of a regulated market or
(b) any body corporate or any undertaking which body or undertaking is or was at any relevant time a subsidiary, an associated undertaking or a related undertaking of the investment firm or the market operator of the regulated market,
the inspector, with the approval of the Court, shall have power to do so, and shall report on the affairs of -
(i) the other investment firm or regulated market or
(ii) the body corporate, undertaking, associated undertaking or related undertaking,
so far as the inspector thinks the results of the investigation are relevant to the investigation of the affairs of the first-mentioned invest