1. No later than 30 days after the notification of the arbitration panel ruling to the Union and the United Kingdom, the respondent shall, if the panel has ruled in favour of the complainant, notify the complainant of the time it considers it will require for compliance (the "reasonable period of time").

2. If there is disagreement between the Union and the United Kingdom on the reasonable period of time to comply with the arbitration panel ruling, the complainant shall, within 40 days of the notification by the respondent under paragraph 1, request the original arbitration panel in writing to determine the length of the reasonable period of time. Such request shall be notified simultaneously to the respondent. The arbitration panel shall notify its decision on the period for compliance to the Union and the United Kingdom within 40 days of the date of submission of the request.

3. In the event of the original arbitration panel, or some of its members, being unable to reconvene to consider a request under paragraph 2, a new arbitration panel shall be established as set out in Article 171. The time limit for notifying the decision shall be 60 days from the date of establishment of the new arbitration panel.

4. The respondent shall inform the complainant in writing of its progress in complying with the arbitration panel ruling referred to in Article 173 at least 1 month before the expiry of the reasonable period of time.

5. The reasonable period of time may be extended by mutual agreement of the Union and the United Kingdom.