reg 22 Security of documents, etc
If the Secretary of State for Defence, or any person authorised on his behalf, certifies that, for reasons of national security, the whole or part of the record of proceedings or other document, or of any exhibit or other thing, ought not to be disclosed otherwise than to the court, or ought to be disclosed only subject to such conditions as he may specify, the registrar must permit inspection or supply a copy of the whole or that part of the document, exhibit or thing only in pursuance of an order of the court and subject to such conditions, if any, as the court may direct.