Hi again about sat nav ' is there any control that dims screen when driving at night as most other navs do !
And there is no change on mine when lights come on or after a certain time ?

Not sure what year your car is but believe mine (63 plate) can be adjusted in main vehicle settings menu?
By way of a suggestion, use the search facility and download an owners handbook, will answer pretty much all of your recent questions

You can adjust the screen brightness/contrast in the settings on the touchscreen. There is also an autodimming function that can be selected that adjusts the brightness automatically depending on the light levels in the cabin. An orange button to the r/h of the touchscreen (In settings) switches that function on and off.

Thankyou all sorted '

the little dome on the dash at the centre base of the windscreen is the light sensor... this is what determines if the nav screen dims (when set to auto) and on models with climate (GS spec and above) it helps adust temperature and air flow too

Right " went into settings and found auto as you said and it was set but the brightness and contrast was turned up as well so I put them down to normal and now screen seems to dark but auto doesn't seem to work as turn lights off but don't get any brighter and if sensered by little some when it's dark outside the screen still remains dark so had to raise contrast and brightness up again to view properly ?
This does not seem right !

My 07 you can dim the screen with the instrument dimmer next to the light switch. I don't think it dims automatically though.

I take it back sorry, it's our other car that dims like this.