“61. In conclusion on this issue, while Lord Wilson's see-saw analogy can assist the court when deciding the question of habitual residence, it does not replace the core guidance given in A v A and other cases to the approach which should be taken to the determination of the habitual residence. This requires an analysis of the child's situation in and connections with the state or states in which he or she is said to be habitually resident for the purpose of determining in which state he or she has the requisite degree of integration to mean that their residence there is habitual.”
“63. The quality of a child's stay in a new environment, in which he has only recently arrived, cannot be assessed without reference to the past. Some habitual residences may be harder to lose than others and others may be harder to gain. If a person leaves his home country with the intention of emigrating and having made all the necessary plans to do so, he may lose one habitual residence immediately and acquire a new one very quickly. If a person leaves his home country for a temporary purpose or in ambiguous circumstances, he may not lose his habitual residence there for some time, if at all, and correspondingly he will not acquire a new habitual residence until then or even later. Of course, there are many permutations in between, where a person may lose one habitual residence without gaining another.”
"In the light of all of this, the position should now be, in my view, that the gateway stage is confined to a straightforward and fairly robust examination of whether the simple terms of the Convention are satisfied in that the child objects to being returned and has attained an age and degree of maturity at which it is appropriate to take account of his or her views. Sub-tests and technicality of all sorts should be avoided. In particular, the Re T approach to the gateway stage should be abandoned."
"46. The leading authorities remain the decisions of the Supreme Court in Re E (Children) (Abduction: Custody Appeal)[2011] UKSC 27 ,[2012] 1 AC 144 and Re S (A Child) (Abduction: Rights of Custody)[2012] UKSC 10 ,[2012] 2 AC 257 . The principles set out in those decisions have been considered by this Court in a number of authorities, notably Re P (A Child) (Abduction: Consideration of Evidence)[2017] EWCA 1677 ,[2018] 4 WLR 16 and Re C (Children) (Abduction: Article 13(b))[2018] EWCA Civ 2834 ,[2019] 1 FLR 1045 . Since the hearing of the present appeal, this Court has handed down judgments in another appeal involving Article 13(b), Re A (A Child) (Article 13(b))[2021] EWCA Civ 939 in which Moylan LJ carried out a further analysis of the case law. I do not intend to add to the extensive jurisprudence on this topic in this judgment, but merely seek to identify the principles derived from the case law which are relevant to the present appeal. 47. The relevant principles are, in summary, as follows. (1) The terms of Article 13(b) are by their very nature restricted in their scope. The defence has a high threshold, demonstrated by the use of the words "grave" and "intolerable". (2) The focus is on the child. The issue is the risk to the child in the event of his or her return. (3) The separation of the child from the abducting parent can establish the required grave risk. (4) When the allegations on which the abducting parent relies to establish grave risk are disputed, the court should first establish whether, if they are true, there would be a grave risk that the child would be exposed to physical or psychological harm or otherwise placed in an intolerable situation. If so, the court must then establish how the child can be protected from the risk. (5) In assessing these matters, the court must be mindful of the limitations involved in the summary nature of the Hague process. It will rarely be appropriate to hear oral evidence of the allegations made under Article 13(b) and so neither the allegations nor their rebuttal are usually tested in cross-examination. (6) That does not mean, however, that no evaluative assessment of the allegations should be undertaken by the court. The court must examine in concrete terms the situation in which the child would be on return. In analysing whether the allegations are of sufficient detail and substance to give rise to the grave risk, the judge will have to consider whether the evidence enables him or her confidently to discount the possibility that they do. (7) If the judge concludes that the allegations would potentially establish the existence of an Article 13(b) risk, he or she must then carefully consider whether and how the risk can be addressed or sufficiently ameliorated so that the child will not be exposed to the risk. (8) In many cases, sufficient protection will be afforded by extracting undertakings from the applicant as to the conditions in which the child will live when he returns and by relying on the courts of the requesting State to protect him once he is there. (9) In deciding what weight can be placed on undertakings, the court has to take into account the extent to which they are likely to be effective, both in terms of compliance and in terms of the consequences, including remedies for enforcement in the requesting State, in the absence of compliance. (10) As has been made clear by the Practice Guidance on "