Instructions:T&C's: Only one discount code to be used per transaction, and can only be used twice per customer. Discount code cannot be used with any other voucher or coupon. Discount code can only be used at time of purchase and not retrospectively. This voucher can only be used on Waterstones.com and not in Waterstone's stores. All prices on Waterstones.com are online only and may differ from Waterstone's stores. Discount does not apply to the Reader from Sony, eBooks or Reader accessories.