Had an issue getting this, so I spoke to live chat and they activated it for me. Worth a shot.
Anyone got this to work recently?
Another (but sometimes random) way to get cheaper Audible books is to check out the Kindle Books offers, which are often free or 99p, on Amazon. You can either search by subject or theme (e.g. children, fiction etc), and select price low to high. There is an option to select the ones with Audible narration, on the left hand menu. Then you can check the "Add narration" button below "Buy". This can be as low as £2.99 - £3.49.
You can buy credits for £6 each (still quite expensive) But I normally wait for half price offers like this. And cancel when they expire.
I looked at using Audible, but i really resent paying for a service that only allows one book per month free, else you have to pay almost full price for another book. I wanted to download some childrens audio books for my little lad, but since they are only an hour long (and cost £7.99 each + monthly fee) its a bloody expensive service!