“"42. Where the change of habitual residence of the child from one State to another occurs at a time when the authorities of the first habitual residence are seised of a request for a measure of protection, the question arises as to whether these authorities retain their competence to take this measure (perpetuatio fori) or whether the change of habitual residence deprives them ipso facto of this jurisdiction and obliges them to decline its exercise. The Commission rejected by a strong majority a proposal by the Australian, Irish, British and United States delegations favourable to the perpetuatio fori. Certain delegations explained their negative vote by their hostility to the very principle of perpetuatio fori in this field and wanted jurisdiction to change automatically in case of a change of habitual residence, while other delegations thought that it would be more simple for the Convention not to say anything on this subject thereby abandoning to the procedural law the decision on perpetuatio fori. The first opinion appeared to be the more exact in the case of a change of habitual residence from one Contracting State to another Contracting State. Indeed it is not acceptable that in such a situation, which is located entirely within the interior of the scope of application of the Convention, the determination of jurisdiction be left to the law of each of the Contracting States. Moreover this solution is one which currently prevails for the interpretation of the Convention of5 October 1961 . On the other hand, in the case of a change of habitual residence from a Contracting State to a non-Contracting State, Article 5 ceases to be applicable from the time of the change of residence and nothing stands in the way of retention of jurisdiction, under the national law of procedure, by the authority of the Contracting State of the first habitual residence which has been seised of the matter, although the other Contracting States are not bound by the Convention to recognise the measures which may be taken by this authority." And: "84. The rules of jurisdiction contained in Chapter II, which have been analysed above, form a complete and closed system which applies as an integral whole in Contracting States when the child has his or her habitual residence on the territory of one of them. In particular, a Contracting State is not authorised to exercise jurisdiction over one of these children if such jurisdiction is not provided for in the Convention. The same solution prevails in the situations described in Article 6, where the child has his or her residence in a Contracting State. In the other situations the mere presence of the child gives rise to the application of Articles 11 and 12, but these articles do not exclude the broader bases for jurisdiction that the Contracting States might attribute to their authorities in application of their national law; only, in this case, the other Contracting States are not at all bound to recognise these broadened bases for jurisdiction which fall outside of the scope of the Convention. The same thing is true, for even stronger reasons, for the children who do not have their habitual residence in a Contracting State, and who are not even present in one. The Commission refused to insert in the text of the Convention a proposal by the Drafting Committee which, inspired by Article 4 of the Brussels and Lugano Conventions, would have provided that, where the child does not have his or her habitual residence in a Contracting State, jurisdiction is, in each Contracting State, governed by the law of that State. This proposal was considered as expressing the correct interpretation of Chapter II of the Convention, but it was not retained for fear that it might itself be interpreted, following the example of the corresponding text of the Brussels and Lugano Conventions, as obligating the other Contracting States to recognise the measures so taken in application of the rules of national jurisdiction – sometimes exorbitant rules – of the Contracting States."”
“107. Where a Convention is silent on a particular point, in this instance the date on which habitual residence falls to be determined for the purposes of Art 5 of the 1996 Convention, the Convention falls to be construed in accordance with the ordinary meaning to be given to its terms in context and having regard to the object and purpose of the Convention (see the Vienna Convention on the Law of Treaties 1936 Art 31). Within this context, two matters fall to be noted at the outset. First, the purpose of the connecting factor of habitual residence in Art 5 of the 1996 Hague Convention, which article determines which Contracting State has substantive jurisdiction to pursue the objects and purpose of the Convention, is to ensure that the jurisdiction with the closest factual connection to the child's family and social life, and the jurisdiction thereby best placed to take substantive decisions regarding the welfare of that child, is the jurisdiction that takes decisions concerning the child's welfare. Second, the Convention contains no principle of perpetuatio fori, by which a Contracting State seised of proceedings in respect of a child habitually resident in that Contracting State will retain jurisdiction for the duration of those proceedings, even if the child loses habitual residence there and becomes habitually resident in another Contracting State. 108. Within this context, the Explanatory Report makes clear that, in circumstances where the Convention forms a complete and closed system as between Contracting States when it has been determined that the child has his or her habitual residence on the territory of one of them, if habitual residence changes from one Contracting State to another Contracting State, the latter Contracting State will gain jurisdiction immediately on that event occurring for the purposes of Art 5(2) of the 1996 Convention. The consequence of this position is that a Contracting State cannot proceed on the basis that, once it is seised of proceedings on the date of issue (or such other relevant date), it will retain jurisdiction under Art 5(1) of the 1996 Convention until the conclusion of those proceedings. Further, and in these circumstances, in the absence of the principle of perpetuatio fori, it will be the factual situation during the course of proceedings, and whether that situation continues to amount to habitual residence as a matter of fact, that determines whether substantive jurisdiction subsists under Art 5(1). In the absence of the principle of perpetuatio fori, it is further axiomatic that habitual residence will fall to be assessed at the current hearing, and not by looking back to an earlier hearing in the proceedings. Indeed, the logical consequence of the foregoing position is that the question of habitual residence will fall to be confirmed at each hearing, albeit that that exercise is unlikely to be an onerous one in the vast majority of cases. Within this context, where the proceedings reach a final hearing the question of whether the court has substantive jurisdiction pursuant to Art 5(1) of the 1996 Convention will still be a potentially live one. This is a fundamental change from the position that pertained under Art 8 of Brussels IIa prior to the departure of the United Kingdom from the European Union. 109. Within this context, and whilst the 1996 Convention is silent on the point, I am satisfied that reading Art 5(1) in its proper context, which includes the absence of the principle of perpetuatio fori , and having regard to the objects and purpose of the Convention, which seeks to ensure that it is always the jurisdiction with the closest factual connection to the child's family and social life that takes decisions concerning the child's welfare, the relevant date on which H's habitual residence falls to be determined in these proceedings for the purposes of Art 5(1) of the 1996 Convention will be the date of the hearing and not the date the court was first seised of the proceedings on18 August 2021 . 110. As this court noted in Warrington CC v T, this position does risk the question of habitual residence, and therefore jurisdiction under the 1996 Hague Convention, being determined by mere effluxion of time over the course of protracted proceedings, particularly where a litigant is seeking to gain advantage by causing delay in proceedings. In cases concerning children who arrive in this jurisdiction, that risk is particularly acute where the court determines upon the issue of proceedings that it has only jurisdiction to take urgent measures under Art 11 of the 1996 Hague Convention. Within this context, as this court observed in Warrington CC v T, it is vital that the question of whether, and on what basis, the court has jurisdiction is determined at the outset of the proceedings and that thereafter the proceedings are resolved in a timely manner based on that determination. It also further emphasises the need for robust case management generally in order to avoid a situation where substantive jurisdiction is ultimately determined by procedural default. 111. Finally, I am also conscious of the observations of Peel J in H v R regarding the potential for the relevant date for determining habitual residence under the 1996 Hague Convention to allow unscrupulous abductors to take advantage of delay, and his further observation that the fact that, as made clear in the Explanatory Report, national law takes over if a Contracting State loses jurisdiction under Art 5(1) may help to prevent that situation. However, in contradistinction to this case and the case of Warrington CC v T, in H v R the children had been taken from the jurisdiction of England and Wales to a non-Contracting State. This case, and the case of Warrington CC v T, concern the opposite situation to that which arose in H v R. In a case in which the subject child is already in England and Wales, the extent to which the fact that national law takes over following a loss by the Contracting State of jurisdiction under Art 5(1) may act to mitigate the risk of delay attendant on the relevant date under the 1996 Hague Convention, if at all, will depend on the facts of the case. In the circumstances, and where the point does not arise on the facts of this case, I propose to say nothing further in this regard.”
“One of the well-judged submissions of Mr Tyler QC on behalf of the respondent is that, were it minded to remove any gloss from the domestic concept of habitual residence (such as, I interpolate, Lord Brandon's third preliminary point in the J case), the court should strive not to introduce others. A gloss is a purported sub-rule which distorts application of the rule. The identification of a child's habitual residence is overarchingly a question of fact. In making the following three suggestions about the point at which habitual residence might be lost and gained, I offer not sub-rules but expectations which the fact-finder may well find to be unfulfilled in the case before him: (a) the deeper the child's integration in the old state, probably the less fast his achievement of the requisite degree of integration in the new state; (b) the greater the amount of adult pre-planning of the move, including pre-arrangements for the child's day-to-day life in the new state, probably the faster his achievement of that requisite degree; and (c) were all the central members of the child's life in the old state to have moved with him, probably the faster his achievement of it and, conversely, were any of them to have remained behind and thus to represent for him a continuing link with the old state, probably the less fast his achievement of it.”
“13. First it [the court] must determine whether the child has, within the meaning of Article 15(3), ‘a particular connection’ with the relevant other member state … Given the various matters set out in Article 15(3) as bearing on this question, this is, in essence, a simple question of fact. For example, is the other member of state the former habitual residence of the child … or the … child’s nationality … Secondly, it must determine whether the court of that other member state ‘would be better placed to hear the case, or a specific part thereof’. This involves an exercise in evaluation, to be undertaken in the light of all the circumstances of the particular case. Thirdly, it must determine if a transfer to the other court ‘is in the best interests of the child.’ This again involves an evaluation undertaken in the light of all the circumstances of the particular child.”
“43. It is the case, as argued on behalf of the mother, that the ‘better placed’ and ‘best interests’ questions are inter-related. Some of the same factors may be relevant to both. But it is clear that they are separate questions and must be addressed separately. The second one does not inexorably follow from the first. The question remains, what is encompassed in the ‘best interests’ requirement? The distinction drawn in In re I remains valid. The court is deciding whether to request a transfer of the case. The question is whether the transfer is in the child’s best interests. The focus of the inquiry is different, but it is wrong to call it ‘attenuated’. The factors relevant to deciding to question will vary according to the circumstances. It is impossible to be definitive. But there is no reason at all to exclude the impact upon the child’s welfare, in the short or the longer term of the transfer itself. What will be its immediate consequences? What impact will it have on the choices available to the court deciding upon the eventual outcome? This is not the same as deciding what outcome will be in the child’s best interests. It is deciding whether it is in the child’s best interests for the court currently seized of the case to retain it or whether it is in the child’s best interests for the case to be transferred to the requested court.”