Where it appears to the Department that there is good reason to do so, the Department may appoint one or more competent inspectors to investigate and report on the membership of any company, and otherwise with respect to the company, for the purpose of determining the true persons who are or have been financially interested in the success or failure (real or apparent) of the company or able to control or materially to influence its policy.

The appointment of inspectors under this Article may define the scope of their investigation (whether as respects the matters or the period to which it is to extend or otherwise) and in particular may limit the investigation to matters connected with particular shares or debentures.

If an application for investigation under this Article with respect to particular shares or debentures of a company is made to the Department by members of the company, and the number of applicants or the amount of shares held by them is not less than that required for an application for the appointment of inspectors under Article 424(2)(a) or (b), then, subject to the following provisions, the Department shall appoint inspectors to conduct the investigation applied for.

The Department shall not appoint inspectors if it is satisfied that the application is vexatious; and where inspectors are appointed their terms of appointment shall exclude any matter in so far as the Department is satisfied that it is unreasonable for it to be investigated.

The Department may, before appointing inspectors, require the applicant or applicants to give security, to an amount not exceeding £5,000, or such other sum as it may by order subject to negative resolution specify, for payment of the costs of the investigation.

If on an application under paragraph (3) it appears to the Department that the powers conferred by Article 437 are sufficient for the purposes of investigating the matters which inspectors would be appointed to investigate, it may instead conduct the investigation under that Article.

Subject to the terms of their appointment, the inspectors' powers extend to the investigation of any circumstances suggesting the existence of an arrangement or understanding which, though not legally binding, is or was observed or likely to be observed in practice and which is relevant to the purposes of the investigation.