There is a £3.99 for 3 months offer on the rotating banner of the Audible home page at the moment (item 2) in case anyone is still looking for a discount. I already have an account with them but haven't had a subscription for over a year, so I think you need to have an account to see this.
Yep, now expired. Damn!
Just missed out! Sorry, this promotion appears to have expired. If you think we have made a mistake, please contact Customer Care.
It worked for me too, thanks. However I’ve not seen any of the usual sales on (2 for 1, or buy 3 get £10). Is it just me or have they stopped doing these kind of sales?
Still working today via Smithy's link