Paragraph 37 Examination of witness who has not been called by any party
(1)
The court may call and examine, or grant a commission to examine, as a witness in a case, any person—
(a)
whose evidence appears to it to be necessary for the fair and just determination of a matter in dispute; but
(b)
who has not been called by any of the parties.
(2)
If the court exercises its powers under paragraph (1), it may direct that the fees and expenses of the witness are to be paid, as expenses of the case, by the parties, or by any of them, in such proportions as are specified in the direction.