(1) An application to vary, revoke or extend an intervention order may be made to the court by any of the following persons—
(a) a party to the proceedings in which the order was made;
(b) if the affected person is a child and the application for an intervention order was made with the consent of a parent under section 11(1)(c)(iii) , that parent;
(c) if the affected person is a child who is 14 years of age or over, the affected person but only with the leave of the court.
(2) If the applicant is not a police officer or the affected person or respondent, the application may be made only with the written consent of—
(a) the affected person; or
(b) if the affected person is a child and the application for the intervention order was made with the consent of a parent under section 11(1)(c)(iii) , that parent.