“[The parents] ask for the children to be returned forthwith to them in France [subject to the following conditions]: (a) The French authorities (national and local) confirming in writing that (i) the children can enter lawfully to France and explaining how that will happen; and (ii) the children will be placed in their parents’ care on arrival in France and will remain in their parents’ care; (b) Kent County Council will arrange for the children to fly to France to be reunited with their children accompanied by a social worker and by their maternal aunt.”