1.   The requested authority shall notify the requesting competent authority or ESMA, as appropriate, where it becomes aware of circumstances that may lead to a delay of more than five working days beyond the estimated date of response specified in accordance with Article 3(1).

2.   Where the request has been qualified as urgent by the requesting competent authority or ESMA, as appropriate, the requested competent authority or ESMA, as appropriate, shall agree on the frequency with which it will update the requesting party on any progress made regarding the processing of the request and about the estimated date of response.

3.   Competent authorities and ESMA shall cooperate to resolve any difficulties that may arise in processing a request.

4.   Competent authorities and ESMA shall provide, where appropriate, feedback to each other on the usefulness of assistance received, the outcome of the case in relation to which the assistance was sought and any problems encountered in providing such assistance.