Bit of an update for you all...
I've finally got myself sorted now, with the latest map CD. After faffing around buying loads of cheap
discs which turned out to be the wrong versions (CNI2 instead of CNI1, etc), I re-sold them and bit the bullet, buying the official 2009/10 CD with iTMC from Navteq, which works like a treat.
I still can't update the languages/operating system though. I think my car may have a decent recent version, but my dad's just bought a Vel Satis too and his has the 2002 operating software, so any ideas how to update it as it won't accept 4.6? But at least his car accepts the Navteq 2009/10 UK map CD and iTMC works for him too.