“17. The general rule is that hearings are carried out, and judgments and orders are made, in public. This applies to applications for interim non-disclosure orders. Derogations can only be justified in exceptional circumstances when they are strictly necessary as measures to secure the proper administration of justice. Where justified, they should be no more than strictly necessary to achieve their purpose. This Court should carefully scrutinise any application for such derogations. They should be reviewed on the return date. The leading case is JIH v News Group Newspapers[2011] 1 WLR 1645 , CA, see paras. 19 to 25. 18. There is ample support for a private hearing on an application relating to theft of confidential information and blackmail, see: PML, at para. 14; Ince at para. 4. See also XXX v Persons Unknown (no1)[2022] EWHC 1578 (QB) , per Chamberlain J at para. 6; and Pendragon v Persons Unknown[2022] EWHC 2985 (QB) , per Collins Rice J, at para. 3.”
"A person is guilty of blackmail if, with a view to gain for himself or another .... he makes any unwarranted demand with menaces"