If you receive an error message to say your voucher code is invalid, there could be different reasons for this:The code is not applicable to the product that you are trying to purchase. Most of our codes are only valid for a particular product or range. Please double check that you are using the code on a valid product.The code has been entered incorrectly. To ensure the code has been typed correctly, please copy and paste the code into the voucher code box, and click 'Apply Coupon'.The code has expired. Most codes are only valid for a limited period. The period should be stated where you received the code.