"In the circumstances mentioned in subsection (4), a court shall have regard in particular to - (a) the ascertainable wishes and feelings of the child concerned (considered in the light of his age and understanding); (b) his physical, emotional and educational needs; (c) the likely effect on him of any change in his circumstances; (d) his age, sex, background and any characteristics of his which the court considers relevant; (e) any harm which he has suffered or is at risk of suffering; (f) how capable each of his parents, and any other person in relation to whom the court considers the question to be relevant, is of meeting those needs; (g) the range of powers available to the court under this Act in the proceedings in question." (Emphasis added).