I've just bought a 2004 A8 4.2 and whilst it has full MMI, dvd based nav and TV function it doesn't have bluetooth or any phone prep (unbeleivable on a car like this). Audi UK say they have no retrofit solution and even if they did they appear not to want to touch it.
Am therefore considering buying the Kufatec "bluetooth only" kit but need to find someone to fit it if I purchase - where abouts in the UK are you? Also, have you installed any MMY/Kufatec systems since your last posting?
Kit details in German - but has image:
Audi A5 3.0 TDI Sport - 19" Y wheels, Meteor Grey, black leather, LED lights, MMI, Music Interface, Active Xenons, DAB radio, Active Key, B&O, voice control, power heated seats, storage pack, light pack, parking advanced, black head lining.