4. Section 3 of the Principal Act is amended by adding at the end the following subsections:
“(5) For the purposes of this Act, a document or statement is to be taken to be furnished to, or a notice or other notification is to be taken to be served on or given to, a natural person whose present or any previous place of residence or business is unknown if it is furnished, served or given in accordance with a direction of the Tribunal.
“(6) A reference in this Act to the hearing of a proceeding includes a reference to—
(a) a directions hearing under subsection 32 (1A);
(b) a hearing in respect of an application for an extension of time;
(c) a hearing in respect of a request under section 41 in relation to an order staying or otherwise affecting the operation or implementation of a decision;
(d) a hearing to determine a question relating to the Tribunal's jurisdiction; or
(e) a hearing to determine any other preliminary issue;
but does not include—
(f) a conference under section 33; or
(g) a mediation under section 33A.”.