71The Member States are nevertheless required, under Article 4(3) TEU, to facilitate the achievement of the Commission’s tasks, which consist inter alia, pursuant to Article 17(1) TEU, in ensuring that the provisions of the FEU Treaty and the measures taken by the institutions pursuant thereto are applied. In particular, account should be taken of the fact that, where it is a question of checking that the national provisions intended to ensure effective implementation of a directive are applied correctly in practice, the Commission, which does not have investigative powers of its own in the matter, is largely reliant on the information provided by any complainants and by the Member State concerned (see, inter alia, Commission v Ireland, paragraphs 42 and 43, and Commission v United Kingdom, paragraph 44).
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