Mercedes-Benz: Command RDS-TMC in UK

I understand that RDS-TMC is now broadcast in the UK alongside the Classic
FM signal. I've a Merc Command system which is supposed to be RDS-TMC
enabled. I've also installed the latest discs. I've set up the unit to
create routes using RDS-TMC, and the radio then retunes automatically to
Classic FM, but I've yet to see any traffic messages on the screen.

Some questions:

1. I'm confused about why the unit would need to retune to Classic FM -
surely it receives the RDS-TMC output quietly in the background without me
having to listen to the 1812!

2. Has anyone seen any traffic messages in the UK from RDS-TMC?

3. Also www.rds-tmc.co.uk seems content free - but I cannot see anyone yet
talking about this in the UK- and I would have thought that the launch of it
would be "news" that at least motorists would be talking about. What's
going on!?

4. Anyone any idea what I need to do to receive traffic messages through my
system?

K.