It seems that the "infotainment" options offered in the UK (as opposed to Germany, or Macedonia for example) are a little bit different than for the other countries, but nevertheless:
- The basic/standard radio is the Chorus, which doesn't have a SDHC-slot and comes with a monochrome screen (on the dashboard)
- The mid-of-the-range model is the Concert, which on top of Chorus has a SDHC-slot and a color screen
- The Symphony is the top model (short of MMI) and on top of Concert it has a CD-changer in the glove department
I guess that for most of us, a CD-changer is not something that we would miss, while a SDHC-slot and a color screen do make a difference. Additionally, I think that Symphony, Concert and Chorus have all the same active output power.
I personally took the Concert radio in combination with Audio Sound System (a 255 EUR option in Germany, 300 in Macedonia). The Audi Sound System is much cheaper than the Bang&Olufsen system and - while I didn't have the chance to hear them both - the A.S.S. sounds pretty much OK (no significant distortion when turned up loud, much much better than most serial-production cars' sound systems but still somewhat worse than a good home stereo).
Still, as I could guess from the posts above, you don't have the choice of selecting individual options in the UK and you have to buy them in packs..? Or it's cheaper that way and you can still order indiv.opt.?