Thanks for posting that follow-up - it's nice to hear that the information we have here in the forum is useful.
In the North American market, software version 0220 in the J523 creates a known problem with the analog clock in the center of the dash losing time.
The newest version of the J523 software for Europe is, I think, 253, but I am not 100% sure of that. There is a 223 version out there, and I know that was recently (end of August 2006) superceded by a higher version. Also be aware that the software for the navigation controller (the navigation CD reader) needs to be updated at the same time that the J523 is updated. This process is automatic when the update disc is installed.
Lastly, as you probably noticed from reading that other thread, the update process can take a long time (several hours, at least), so, plan to drop your car off for a full day, and be absolutly certain that the VW dealer hooks up a battery maintainer to the terminals of the left battery before starting the work. There are details about how to use a battery maintainer at this post: NAPA Battery Maintainer for a Phaeton (Includes TB 00-03-11, 27–04–01, and 27–06–06).
If your J523 software is at version 0220, then your instrument cluster (controller 17) software is probably below the latest release also. Please see this post for information about updating the instrument cluster software: TB: Distortion in the Display Unit in the Instrument Cluster (MFI, or Y24). Finally, while the car is at the VW dealer, make sure that your battery management controller (controller 71) is at software version 2700 or higher. The battery management controller software cannot be flash-updated - replacement of the part is required if the software is at 2500 or 2600 status. The software and hardware status can be determined by scanning this controller with a diagnostic scan tool. Part numbers that end in A have software 2500, those that end in B have software 2600, both of which are undesirable. You want a part number that ends in either C (software 2700) or D (software 2800). C is just as good as D, so there is no reason to replace the part if you have a battery management controller with a C suffix on the part number.
There is also a campaign out to replace some other parts in early production (MY 2003) Phaetons - please send me an email at this address: moore99 at rogers dot com - and I will send you more information by email.