A barrister must not,
outside an ex parte application or a hearing of which an opponent has had
proper notice, communicate in the opponent’s absence with the court
concerning any matter of substance in connection with current proceedings
unless:
(a) the
court has first communicated with the barrister in such a way as to require
the barrister to respond to the court, or
(b) the
opponent has consented beforehand to the barrister dealing with the court in a
specific manner notified to the opponent by the barrister.