“Routinely, orders are made for passports and travel documents of both child and accompanying adult to be handed over and retained to the order of the court, and injunctions are granted to inhibit removal of the child from the address at which he or she has been located, and restraining removal from England and Wales. The port alert procedure can be activated in cases where there is a ‘real and imminent’ risk of removal. Sometimes further requirements are imposed, such as an obligation to report at specified times to a local police station.”