(1)The High Court may, upon an application under this subsection, by order annul a regulated adoption—
(a)on the ground that at the relevant time the adoption was prohibited by a notified provision, if under the internal law then in force in the country of which the adopter was then a national or the adopters were then nationals the adoption could have been impugned on that ground;
(b)on the ground that at the relevant time the adoption contravened provisions relating to consents of the internal law relating to adoption of the country of which the adopted person was then a national, if under that law the adoption could then have been impugned on that ground;
(c)on any other ground on which the adoption can be impugned under the law for the time being in force in the country in which the adoption was effected.
(2)The High Court may, upon an application under this subsection—
(a)order that an overseas adoption or a determination shall cease to be valid in Great Britain on the ground that the adoption or determination is contrary to public policy or that the authority which purported to authorise the adoption or make the determination was not competent to entertain the case ;
(b)decide the extent, if any, to which a determination has been affected by a subsequent determination.
(3)Any court in Great Britain may, in any proceedings in that court, decide that an overseas adoption or a determination shall, for the purposes of those proceedings, be treated as invalid in Great Britain on either of the grounds mentioned in subsection (2).
(4)An order or decision of the Court of Session on an application under subsection (3) of section 6 of the Adoption Act 1968 shall be recognised and have effect as if it were an order or decision of the High Court on an application under subsection (3) of this section.
(5)Except as provided by this section and section 52(3) the validity of an overseas adoption or a determination shall not be impugned in England and Wales in proceedings in any court.