20It is important to note at the outset that Article 56 TFEU precludes the application of any national rules which have the effect of making the provision of services between Member States more difficult than the provision of services purely within a Member State (see, inter alia, Joined Cases C-155/08 and C-157/08X and Passenheim-van Schoot [2009] ECR I-5093, paragraph 32 and the case-law cited).