If you see this message, there are a few things that might have happened. 

Could you be applying a gift voucher code to this box ? There is a separate box for you to enter a voucher in - you may need to scroll down to see it, depending on what device you're using. 

Could you have entered the code slightly incorrectly? Zeros and letter O can look similar, and any additional spaces may prevent the code from working, so please double-check. 

Is the code from an old email or magazine? if so, it may well be out of date. 

But sometimes we do get it wrong. If you know the code is correct and in date, please use the 'not helpful' button below, and you will be able to message us, so we can check this out and find out what's wrong.