13. For rule 6.11, and for the heading “Notice of non-service”, substitute—
6.11 Where—
(a)a document to be served by the court is served by post; and
(b)such document is returned to the court,
the court must send notification to the party who requested service stating that the document has been returned.
6.11A Where—
(a)the court bailiff is to serve a document; and
(b)the bailiff is unable to serve it,
the court must send notification to the party who requested service.”.