Criminal Procedure Rules may make provision for—
requiring any party to proceedings before the court to disclose to the other party or parties any expert evidence which he proposes to adduce in the proceedings; and
prohibiting a party who fails to comply in respect of any evidence with any requirement imposed by virtue of paragraph (a) above from adducing that evidence without the leave of the court.
Criminal Procedure Rules made by virtue of this section may specify the kinds of expert evidence to which they apply and may exempt facts or matters of any description specified in the rules.