15.3.—(1) Expert evidence shall be restricted to that which is necessary to assist the court to resolve the issues in the proceedings.
(2) The court may give permission to file or adduce expert evidence as mentioned in rule 15.2(1) and 15.5(1) only if satisfied that the evidence—
(a)is necessary to assist the court to resolve the issues in the proceedings; and
(b)cannot otherwise be provided either—
(i)by a rule 1.2 representative; or
(ii)in a report under section 49 of the Act.