Well I got it out as follows
1. Remove ash tray
2. There are 2 screws holding ashtray unit in, One in the centre and one to the right hand side. both posidrive and both at a 45 degree angle. Dont drop them into the housing, lots of wires in there.
3. Select 2nd or 4th gear (It gets lever out of the way)
4. Lift unit out, as you do it will also loosen the gear lever/heated seats plate. pull this back out of the way and disconnect the 2 wiring looms and light from the ash try casing.
There are release clips on the looms and turn and pull the bulb holder.
5. When removed, 2 more screws are exposed on the bottom left and right of the SatNav panel, unscrew these
6. The panel is now only retained by 2 hidden clips. By pulling the panel towards you and down slightly place a flat blade screwdriver gently in the vertical gaps created between the sides of the panel and outer trim and lever the panel, it will un clip.
7. The retaining bracket for the DVD reader is now exposed. 2 bolts in the top of the frame and 2 nuts below need to be removed.
Un clip all the connectors to the back of the unit and hey presto it's free!
Now all you've got to do is find a replacement unit!!!
Oh and another thing. when out the touch display screen does not function at all while the unit is disconnected.
I'll let you know how I get on finding a unit and if it resolves the problem.
Alan, January 2008