"… exercising parental responsibility over the minor children of the parties, which are: [A], [B], [C], entrusts both parents, determining the whereabouts of minor children to the plaintiff [mother]."
"… the common purpose of promoting international co-operation for the benefit of children and avoiding conflicts of jurisdiction. Treating the best interests of children as a primary consideration, they provide a mechanism for the mutual recognition of judicial decisions, so that a judgment in one participating state is to be recognised and enforced in another participating state in effect as if it was a domestic judgment given in that state ."
"If the court determines that the 2016 order should not be recognised with reliance on Article 23(f) BIIR , it may be that it will not then be necessary for the court to go on to consider the remaining grounds of appeal …"
"The decision to refuse to return these children to Poland is, it is submitted, a decision relating to parental responsibility. The necessary requirement for any application under the 1980 Hague Convention is that the holder has rights of custody pursuant to Article 3 of that Convention. Article 5 (a) further provides that those rights include the right to determine the place of residence of the child. Council Regulation 2201/2203 by Article 2 (7) provides that the term parental responsibility shall include rights of custody. The pursuit of the return of the children by the 1980 Hague Convention is an exercise in parental responsibility by assertion of the holder's rights of custody and is the objective of the application under the Convention."
"… it is to be noted that "public policy" in the context of Article 23(a) of BIIa is to be construed very restrictively: see, for example In the Matter of D (A Child) International Recognition)[2016] EWCA Civ 12 ;[2016] 1 WLR 2469 ."
"In Re L (Brussels II Revised: Appeal)[2013] 1 FLR 430 , Munby LJ, as he then was, said: "[46] Article 23(a) , in my judgment, contains a very narrow exception and, consistently with the entire scheme of BIIR and with the underlying philosophy is spelt out in Recital (21), sets the bar very high."
"[37] Recourse to the public policy clause inarticle 27(1) of the convention [then Brussels 1] can be envisaged only where recognition or enforcement of the judgment delivered in another contracting state would be at variance to an unacceptable degree with the legal order of the state in which enforcement is sought in as much as it infringes a fundamental principle.""
"English courts will not enforce or recognise a right, power, capacity, disability or legal relationship arising under the law of a foreign country, if the enforcement or recognition of such right, power, capacity, disability or legal relationship would be inconsistent with the fundamental public policy of English law"
"… in English domestic law it is now well settled that the doctrine of public policy should only be invoked in clear cases in which the harm to the public is substantially incontestable, and does not depend upon the idiosyncratic inferences of a few judicial minds. The court will only take the exceptional and momentous decision of non-recognition where recognition would violate some fundamental principle of justice, some prevalent conception of good morals, or some deep-rooted tradition of the common weal."