I'm not sure the BM53/54 differences apply to Z4/X3's - I may be wrong but my radio supports TMC fine. For example, if plan a route around the M25 or to Heathrow T1, I immediately see hold-ups and missing lanes and the Nav warns me of this, and reroutes if the delay warrants a new route. It may well be doing this automatically en-route (I haven't yet experienced this but wife claims it works ok) which makes this dynamic route option unnecessary anyway ?

Looking at realoem, the Z4/X3 CID (central info display) controller part (the CD/MD radio) numbers seem the same irrespective of what country you're in. I don't have a CD changer, I use an icelink plus system instead - this works fine with the radio. The radio only has single tuner though - as soon as I switch to Radio 2, (from CD, Icelink) the TMC icon goes from Green to Red as Classic FM is no longer available.

What I find really frustrating in the UK is the total lack of knowledege within the dealer community and BMW customer service in Bracknell of these features - big thanks to you guys at X3/5world - this really is the only place to get accurate info regarding these nav systems.