(1) If a preliminary act is to be filed (other than by electronic communication) with a court, the preliminary act must be filed in a closed envelope that:
(a) is marked "Confidential"; and
(b) is sealed with the seal of the court; and
(c) bears the date of filing.
(2) If a preliminary act is to be sent by electronic communication to a court for filing, the preliminary act:
(a) must be marked "Confidential"; and
(b) must be accompanied by a statement that the preliminary act is a "confidential preliminary act which must only be opened in accordance with rule 28 of the Admiralty Rules 1988 ".
(3) For the purposes of this rule, file includes lodge for filing.