4 Evidence of foreign law
(1) It is hereby declared that in civil proceedings a person who is suitably qualified to do so on account of his knowledge or experience is competent to give expert evidence as to the law of any country or territory outside the United Kingdom, or of any part of the United Kingdom other than England and Wales, irrespective of whether he has acted or is entitled to act as a legal practitioner there.
(2) Where any question as to the law of any country or territory outside the United Kingdom, or of any part of the United Kingdom other than England and Wales, with respect to any matter has been determined (whether before or after the passing of this Act) in any such proceedings as are mentioned in subsection (4) below, then in any civil proceedings (not being proceedings before a court which can take judicial notice of the law of that country, territory or part with respect to that matter)—
(a) any finding made or decision given on that question in the first-mentioned proceedings shall, if reported or recorded in citable form, be admissible in evidence for the purpose of proving the law of that country, territory or part with respect to that matter; and
(b) if that finding or decision, as so reported or recorded, is adduced for that purpose, the law of that country, territory or part with respect to that matter shall be taken to be in accordance with that finding or decision unless the contrary is proved:
Provided that paragraph (b) above shall not apply in the case of a finding or decision which conflicts with another finding or decision on the same question adduced by virtue of this subsection in the same proceedings.
(3) Except with the leave of the court, a party to any civil proceedings shall not be permitted to adduce any such finding or decision as is mentioned in subsection (2) above by virtue of that subsection unless he has in accordance with rules of court given to every other party to the proceedings notice that he intends to do so.
(4) The proceedings referred to in subsection (2) above are the following, whether civil or criminal, namely—
(a) proceedings at first instance in any of the following courts, namely the High Court, the Crown Court, a court of quarter sessions, the Court of Chancery of the county palatine of Lancaster and the Court of Chancery of the county palatine of Durham;
(b) appeals arising out of any such proceedings as are mentioned in paragraph (a) above;
(c) proceedings before the Judicial Committee of the Privy Council on appeal (whether to Her Majesty in Council or to the Judicial Committee as such) from any decision of any court outside the United Kingdom,
(5) For the purposes of this section a finding or decision on any such question as is mentioned in subsection (2) above shall be taken to be reported or recorded in citable form if, but only if, it is reported or recorded in writing in a report, transcript or other document which, if that question had been a question as to the law of England and Wales, could be cited as an authority in legal proceedings in England and Wales.