6.—Section 3 of this Act is in addition to, and not in substitution for, any privilege or defence available in legal proceedings, by virtue of any enactment or rule of law in force immediately before the passing of this Act, in respect of the communication by a person to another (whether that other person is an appropriate person or not) of his or her opinion that—

(a) a child has been or is being assaulted, ill-treated, neglected or sexually abused, or

(b) a child's health, development or welfare has been or is being avoidably impaired or neglected.