The promotion commences 25th August and closes on 30th September 2015. The Promoter reserves the right to extend or reduce the duration for a valid reason, provided that the change will be published in this page www.ef.com/exchangeweek. The Promoter also reserves the right to modify the terms of the competition (including but not limited to the Conditions of Entry) as well as cancel the competition due to a diligent cause and inform the public on the aforementioned page.