18.5.—(1) Subject to paragraph (2), a copy of the application notice must be served on—
(a)each respondent;
(b)in relation to proceedings under Part 11, the person who is, or, in the case of an application to start proceedings, it is intended will be, the subject of the proceedings; and
(c)in relation to proceedings under Parts 12 and 14, the children's guardian (if any).
(2) An application may be made without serving a copy of the application notice if this is permitted by—
(a)a rule;
(b)a practice direction; or
(c)the court.
(Rule 18.8 deals with service of a copy of the application notice.)