[X1Article 76 U.K. Cooperation
1. The competent authorities of the Member States shall communicate to each other all information regarding:
(a) measures taken to implement this Regulation;
(b) changes in their legislation which may affect the implementation of this Regulation.
2. For the purposes of this Regulation, the authorities and institutions of the Member States shall lend one another their good offices and act as though implementing their own legislation. The administrative assistance given by the said authorities and institutions shall, as a rule, be free of charge. However, the Administrative Commission shall establish the nature of reimbursable expenses and the limits above which their reimbursement is due.
3. The authorities and institutions of the Member States may, for the purposes of this Regulation, communicate directly with one another and with the persons involved or their representatives.
4. The institutions and persons covered by this Regulation shall have a duty of mutual information and cooperation to ensure the correct implementation of this Regulation.
The institutions, in accordance with the principle of good administration, shall respond to all queries within a reasonable period of time and shall in this connection provide the persons concerned with any information required for exercising the rights conferred on them by this Regulation.
The persons concerned must inform the institutions of the competent Member State and of the Member State of residence as soon as possible of any change in their personal or family situation which affects their right to benefits under this Regulation.
5. Failure to respect the obligation of information referred to in the third subparagraph of paragraph 4 may result in the application of proportionate measures in accordance with national law. Nevertheless, these measures shall be equivalent to those applicable to similar situations under domestic law and shall not make it impossible or excessively difficult in practice for claimants to exercise the rights conferred on them by this Regulation.
6. In the event of difficulties in the interpretation or application of this Regulation which could jeopardise the rights of a person covered by it, the institution of the competent Member State or of the Member State of residence of the person concerned shall contact the institution(s) of the Member State(s) concerned. If a solution cannot be found within a reasonable period, the authorities concerned may call on the Administrative Commission to intervene.
7. The authorities, institutions and tribunals of one Member State may not reject applications or other documents submitted to them on the grounds that they are written in an official language of another Member State, recognised as an official language of the Community institutions in accordance with Article 290 of the Treaty.]