141. Expert's report

(1) Expert evidence is to be given in a written report unless the Court directs otherwise.
(2) An expert's report must comply with the requirements set out in any relevant practice direction, must state at the end that the expert understands and has complied with his duty to the Court and must state the substance of all material instructions, whether written or oral, on the basis of which the report was written; and such instructions shall not be privileged against disclosure.
(3) Where a party has disclosed an expert's report, any party may use that expert's report as evidence at the trial.
(4) A party who fails to disclose an expert's report may not use the report at the trial or call the expert to give evidence orally unless the Court gives permission.