“an application for the revocation of a placement order has been made” can be interpreted to include the application for leave to make the application; (2) whether the wording of section 24(5) should be interpreted in this way so as to give effect to the Convention Rights of the applicant to a fair hearing, and to family life; and (3) if not, whether section 24(5) is incompatible with the ECHR, and if so, whether a declaration to that effect should be made.”