91. A complaint may be made by or, with the patient’s consent, on behalf of a patient, or former patient, who is receiving or has received services under the contract, or —
(a)where the patient is a child —
(i)by either parent, or in the absence of both parents, the guardian or other adult who has care of the child,
(ii)by a person duly authorised by a local authority to whose care the child has been committed under the provisions of the Children Act 1989(1), or
(iii)by a person duly authorised by a voluntary organisation by which the child is being accommodated under the provisions of that Act;
(b)where the patient is incapable of making a complaint, by a relative or other adult who has an interest in the patient’s welfare.