“24 Consent is an exception that is infrequently pleaded and still less frequently proved. The applicable principles were considered by this court in In re P-J (Children) (Abduction: Consent)[2010] 1 WLR 1237 , drawing on the decisions in In re M (Abduction) (Consent: Acquiescence)[1999] 1 FLR 171 (Wall J); In re C (Abduction: Consent)[1996] 1 FLR 414 (Holman J); In re K (Abduction: Consent)[1997] 2 FLR 212 (Hale J); and In re L (Abduction: Future Consent)[2008] 1 FLR 914 (Bodey J). Other decisions of note are C v H (Abduction: Consent)[2010] 1 FLR 225 (Munby J); and A v T (Abduction: Consent)[2012] 2 FLR 1333 (Baker J). 25 The position can be summarised in this way: (1) The removing parent must prove consent to the civil standard. The inquiry is fact-specific and the ultimate question is: had the remaining parent clearly and unequivocally consented to the removal? (2) The presence or absence of consent must be viewed in the context of the common sense realities of family life and family breakdown, and not in the context of the law of contract. The court will focus on the reality of the family’s situation and consider all the circumstances in making its assessment. A primary focus is likely to be on the words and actions of the remaining parent. The words and actions of the removing parent may also be a significant indicator of whether that parent genuinely believed that consent had been given, and consequently an indicator of whether consent had in fact been given. (3) Consent must be clear and unequivocal but it does not have to be given in writing or in any particular terms. It may be manifested by words and/or inferred from conduct. (4) A person may consent with the gravest reservations, but that does not render the consent invalid if the evidence is otherwise sufficient to establish it. (5) Consent must be real in the sense that it relates to a removal in circumstances that are broadly within the contemplation of both parties. (6) Consent that would not have been given but for some material deception or misrepresentation on the part of the removing parent will not be valid. (7) Consent must be given before removal. Advance consent may be given to removal at some future but unspecified time or upon the happening of an event that can be objectively verified by both parties. To be valid, such consent must still be operative at the time of the removal. (8) Consent can be withdrawn at any time before the actual removal. The question will be whether, in the light of the words and/or conduct of the remaining parent, the previous consent remained operative or not. (9) The giving or withdrawing of consent by a remaining parent must have been made known by words and/or conduct to the removing parent. A consent or withdrawal of consent of which a removing parent is unaware cannot be effective. 26 All of these matters are well-established, with the exception of the last point, which did not arise for consideration in the reported cases. As to that, there are compelling reasons why the removing parent must be aware of whether or not consent exists. The first is that as a matter of ordinary language the word “consent” denotes the giving of permission to another person to do something. For the permission to be meaningful, it must be made known. This natural reading is reinforced by the fact that consent appears in the Convention as a verb (“avait consenti/had consented”): what is required is an act or actions and not just an internal state of mind. But it is at the practical level that the need for communication is most obvious. Parties make important decisions based on the understanding that they have a consent to relocate on which they can safely rely. It would make a mockery of the Convention if the permission on which the removing parent had depended could be subsequently invalidated by an undisclosed change of heart on the part of the other parent, particularly as the result for the children would then be a mandatory return. Such an arbitrary consequence would be flatly contrary to the Convention’s purpose of protecting children from the harmful effects of wrongful removal, and it would also be manifestly unfair to the removing parent and the children.”
“[70] The authorities make clear that the court is evaluating whether there is a grave risk based on the allegations relied on by the taking parent as a whole, not individually.
‘[2] The Hague Convention of 1980 is arguably the most successful ever international treaty and it has over 90 subscribers to it, over half the countries in the world. The underlying and central foundation of the Convention is that, where a child has been unilaterally removed from the land of her habitual residence in breach of someone's rights of custody, then she should be swiftly returned to that country for the courts of that country to decide on her long-term future. [3] There are very few exceptions to this and the exceptions that do exist have to be interpreted very narrowly in order that the central premise of the Convention is not fatally undermined. It is important to understand what the Convention does not do. The Convention does not order a child who has been removed in the circumstances I have described to live with anybody. The Convention does not provide that the parent who is left behind should, on the return of the child, have contact or access in any particular way. The Convention does not provide that, when an order for return to the child's homeland is made, the child should stay there indefinitely. All the Convention provides is that the child should be returned for the specific purpose and limited period to enable the court of her homeland to decide on her long-term future. That is all it decides’