For the purposes of an investigation under Part V of this Act the Commissioner may require any employee, officer or member of the relevant body concerned or any other person who in his opinion is able to furnish information or produce documents relevant to the investigation to furnish any such information or produce any such document.

For the purposes of any such investigation the Commissioner shall have the same powers as the Court (which in this Schedule means, in relation to England and Wales, the High Court, in relation to Scotland, the Court of Session, and in relation to Northern Ireland, the High Court of Northern Ireland) in respect of the attendance and examination of witnesses (including the administration of oaths or affirmations and the examination of witnesses abroad) and in respect of the production of documents.

No obligation to maintain secrecy or other restriction upon the disclosure of information obtained by or furnished to persons in Her Majesty’s service, whether imposed by any enactment or by any rule of law, shall apply to the disclosure of information for the purposes of an investigation under Part V of this Act.

The Crown shall not be entitled in relation to any such investigation to any such privilege in respect of the production of documents or the giving of evidence as is allowed by law in legal proceedings.

No person shall be required or authorised by Part V of this Act and this Schedule to furnish any information or answer any question relating to proceedings of the Cabinet or of any committee of the Cabinet or to produce so much of any document as relates to such proceedings.

For the purposes of this paragraph a certificate issued by the Secretary of the Cabinet with the approval of the Prime Minister and certifying that any information, question, document, or part of a document so relates shall be conclusive.

Subject to paragraph 9 above, no person shall be compelled for the purposes of an investigation under Part V of this Act to give any evidence or produce any document which he could not be compelled to give or produce in civil proceedings before the Court.