17.—In this Part—

“Contracting State” means a state in respect of which the Luxembourg Convention is in force in accordance with the provisions of that Convention and shall be construed so that this Part shall have effect in relation to the places as respects which that Convention has effect by virtue of Articles 24 and 25 of that Convention;

“decision relating to custody” has the meaning given to it in Article 1 of the Luxembourg Convention;

“enforcement order” means an order of the Court for the recognition or enforcement of a decision relating to custody to which either Article 7 or 12 of the Luxembourg Convention applies.