Received voucher promptly BUT feel inappropriate for you to seek a review BEFORE have tried to book the activity AND experienced the activity. It would be more appropriate to seek reviews AFTER activity has taken place, to give potential future customers honest customer feedback from those who have already tried the activity. Otherwise, it's meaningless to seek reviews on a piece of paper received with no knowledge of what that is buying yet, and is therefore misleading to future customers to seek reviews from those who have bought your vouchers before we've even attempted to book the activity concerned.