If inspectors appointed under section 431 or 432 to investigate the affairs of a company think it necessary for the purposes of their investigation to investigate also the affairs of another body corporate which is or at any relevant time has been the company's subsidiary or holding company, or a subsidiary of its holding company or a holding company of its subsidiary, they have power to do so; and they shall report on the affairs of the other body corporate so far as they think that the results of their investigation of its affairs are relevant to the investigation of the affairs of the company first mentioned above.
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