Well,
I finally got to the bottom of this issue. Turns out a flash of software version on the original Dension unit resolved everything & now I'm fully multimediaised in the car!
Here is the output form the digital TV tuner:



It has a PVR for live pause & record. You can also view photos on the unit too. I also have a composite input for the iPhone so youtube, netflix, etc. are all possible. You can also watch videos directly stored on the iPod or iPhone.

Next job to fit is: