"In the light of the foregoing and at the cost of some
repetition, it is possible to identify in summary form what
I see as the modern content of the traditional principles
governing the power of a court in this country to order that
proceedings which have been regularly instituted within
jurisdiction should be dismissed or stayed on inappropriate
forum grounds. That power is a discretionary one in the
sense that its exercise involves a subjective balancing
process in which the relevant factors will vary and in which
both the question of the comparative weight to be given to
particular factors in the circumstances of a particular case
and the decision whether the power should be exercised are
matters for individual judgment and, to a significant
extent, matters of impression. The power should only be
exercised in a clear case and the onus lies upon the
defendant to satisfy the local court in which the particular
proceedings have been instituted that it is so inappropriate
a forum for their determination that their continuation
would be oppressive and vexatious to him. Ordinarily, a
defendant will be unable to discharge that onus unless he
can identify some appropriate foreign tribunal to whose
jurisdiction the defendant is amenable and which would
entertain the particular proceedings at the suit of the
plaintiff. Otherwise, that onus will ordinarily be
discharged by a defendant who applies promptly for a stay or
dismissal if he persuades the local court that, having
regard to the circumstances of the particular case and the
availability of the foreign tribunal, it is a clearly
inappropriate forum for the determination of the dispute
between the parties. The reason why that is so is that,
once it is accepted that the adjectives 'oppressive' and
'vexatious' are not to be narrowly or rigidly construed and
are to be applied in relation to the effect of the
continuation of the proceedings rather than the conduct of
the plaintiff in continuing them, the continuation of
proceedings in a tribunal which is a clearly inappropriate
forum would, in the absence of exceptional circumstances
being established by the plaintiff (cf Spiliada Maritime
Corp v Cansulex Ltd (1987) 1 AC 460, at p478), be oppressive
or vexatious to such a defendant if there is some available
and appropriate tribunal in another country. Admittedly,
that approach to the 'vexatious' and 'oppressive' test is
less stringent and less rigid than would have been accepted
in the nineteenth century. Under it, the applicable test
pursuant to traditional principles can, in the ordinary
case, properly be seen as an 'inappropriate forum' test. It
cannot, however, properly be seen as a 'more appropriate
forum' test since the mere fact that a tribunal in some
other country would be a more appropriate forum for the
particular proceeding does not necessarily mean that the
local court is a clearly inappropriate one."