18.
3. Where a decision relating to custody has been registered
under section 16 above, the court in which it is registered
shall have the same powers for the purpose of enforcing the
decision as if it had been made by that court; and
proceedings for or with respect to enforcement may be taken
accordingly.
19. Where an application has been made to a court for the
registration of a decision under section 16 above or for the
enforcement of such a decision, the court may, at any time
before the application is determined, give such interim
directions as it thinks fit for the purpose of securing the
welfare of the child concerned or of preventing changes in
the circumstances relevant to the determination of the
application or, in the case of an application for
registration, to the determination of any subsequent
application for the enforcement of the decision.
20. (1) Where it appears to any court in which such
proceedings as are mentioned in subsection (2) below are
pending in respect of a child that -
(a) an application has been made for the registration of
a decision in respect of the child under section 16
above (other than a decision mentioned in subsection
(3) below) or that such a decision is registered; and
(b) the decision was made in proceedings commenced before
the proceedings which are pending,