For any UK reader of this thread I contacted Audi UK directly with the above info and they told me it isn't possible to get the radio code unless I take it to a dealership and have them plug into the car.
The car has to be plugged in to our equipment, the code is requested from the car ECU and then submitted back to the diagnostic euipment (or something along those lines)
f*** that sh**. Waste of money IMO
New radio from halfrauds bargain bin section for half the price of said main stealer code retreival procedure and 10mins to fit if you don't count having to run a switched live direct from the ignition barrel.
edit: this was for a 2002 A6 with Chorus radio.
It costs about £60+ just to ask a question round 'ere,
my new radio has CD, Radio, USB, front Aux in/iphone/pod charge, Bluetooth. For £30. Go figure.
My old radio takes 6 scratched CDs and 1 old tape
Worth ditching the factory radio just to have the USB and Bluetooth!