You could try looking here:
especially the bit that says "Connect AUX input on Renault Update List HU.pdf "
I'm going to try it myself when I get around to ordering the mini iso connectors.
The key seems to be whether or not you have a HU that says 'update list' on the front. Googling ["update list" aux] gets you lots of resuts some of which lead to a £40 for a pre-built adaptor!