Where the criteria under section 17(1) of the Children Act 1989 (ChA 1989) as to a child in need is met, triggering the duties of a local authority, is interaction between the child’s parents and the local authority voluntary? Will a child automatically becomes subject to the child in need provisions, regardless of whether the parents agree or not, where the child has previously been subject to accommodation under ChA 1989, s 20 and an interim supervision order, when the child is no longer subject to ChA 1989, s 20 (for example, where the child returns home to the parent) but the interim supervision order is continuing?