"The Hague Convention cases on consent required a true and unequivocal consent ..."
"It is obvious that consent must be real. It must be positive and it must be unequivocal. But that is a separate issue from the nature of the evidence required to establish it. There will be circumstances in which the court can be satisfied that such consent has been given, even though it has not been given in writing. It stands to reason, however, that most people who wish to retain or remove a child would be well advised to get written consent before they do so to place the matter beyond argument. There may also be circumstances in which it can be inferred from conduct."