From your photo, you have a Symphony II+, which means that you have dedicated ports for the AUX-In. If you had a Symphony II (2003-2007), you could only install the AUX by using the CD Changer as an emulator.
Because you have the Symphony II+, retrofitting AUX is a pretty easy task.
This is the pin-out diagram of your stereo:
The main question is if you want to do it as OEM, or aftermarket...
If you want aftermarket (£11.20) you would simply need something like this:
Audi A3 (Incl. S3) 03-13 Quadlock AUX In to RCA Adpator Lead Celsus | eBay
(I can't seem to find one with a simple 3.5mm jack, possibly gap in the market there!)
If you want to go OEM (~£30) then you'll need to follow the following: rnseauxin - Audi Retrofit
(Ignore that it says for RNS-E, it also works on the Symphony II+ and you also don't need to buy 1J0 972 977 G)
After either one is fitted, you'll then need to code in the AUX with VCDS.
its not a symphony II+ its a concert II+
Good spot! Still supports AUX the same as Symphony II+.
http://pages.ebay.com/link/?nav=item.view&alt=web&id=321440083143
Could anyone confirm if that would be the right cable?
I mailed the guy on eBay n he confirmed that it is the right one, going to order it so I'll let you know how it goes.
When i unplug the CD player to fit the aux will the CD player ask me for a code?
For Symphony II+ & Concert II+ you need this cable, if you want to do it on the cheap Male 3 5mm Aux Audio Input Cable for Audi VW Skoda Seat MP3 iPod iPhone Music | eBay Or if you want a more OEM look then your could buy this kit. Aux-In Jack - Retrofit - Audi-38981
0?x0xxx:
+1 = Analog Input (AUX)
+2 = Multifunction Steering Wheel
+4 = Telephone
In other words if you don't have phone prep or MFSW then you would recode your wheel to 01x0xxx, if you have MFSW you would recode to 03x0xxx, and if you have phone prep and MFSW then you would recode to 07x0xxx.
brilliant thanks a lot for that. Just waiting for the cable to be delivered I will let u know how I get onModule 56-Radio