17   Evidence

(1)  A Board is not bound by the rules or practice as to evidence and may, subject to subsection (2), inform itself on any matter in such manner as it thinks fit.

(2)  A Board shall not inform itself on, or take into consideration, any matter which has not been disclosed in evidence at a sitting of the Board if the matter is one which ought, in the interests of justice, to be available for challenge or testing by the persons entitled to be present at the sitting.

(3)  Nothing in subsection (2) prevents a Board from informing itself on, or taking into consideration, any matter of which it is entitled to take judicial notice.