In proceedings under this Act—
(a) the appointment as inspector of a person claiming to be, or stated to be, an inspector, and the authority of an inspector to take proceedings or do any act, must be presumed, until the contrary is proved; and
(b) a signature purporting to be of an inspector is taken as the signature it purports to be, until the contrary is proved; and
(c) a document purporting to be a copy of a notice or order issued under this Act by an inspector is admissible as evidence of the issue of the notice or order and of the things in it; and
(d) a certificate purporting to be signed by the chief executive stating the following matters is evidence of the matter—(i) a stated document is a decision, or a copy of a decision, made under this Act;(ii) a stated document is a notice, or a copy of a notice, given under this Act;(iii) a stated document is a document, or a copy of a document, kept under this Act;(iv) on a stated day, a stated person was, or was not, a licensee;(v) on a stated day, a stated person was given a stated notice under this Act.