“Given the existence of s 12 of the 1960 Act which is apt to prevent publication or reporting of the substance of, or the evidence or issues in, the proceedings (save insofar as permitted by the court or as revealed in any judgment delivered in open court), I do not think that, as a generality, it is right to assume that identification of a child as having been involved in proceedings will involve harm to his or her welfare interests or failure to respect the child’s family or private life.”