(1) The Court of Appeal may appoint a special commissioner to inquire into and report on any question referred to the special commissioner by the court if—
(a) the question arises on an appeal under this Part or an application for leave to appeal under this Part; and
(b) the question involves—
(i) prolonged examination of documents or accounts; or
(ii) any scientific or local investigation; and
(c) the court considers that the examination or investigation cannot conveniently be conducted before the court; and
(d) the court considers that it is in the interests of justice to do so.
(2) The Court of Appeal may act on the report of a special commissioner to the extent that the court considers appropriate to adopt the report.
(3) The Court of Appeal may determine the remuneration of a special commissioner.