Today temp shows as 2 degrees in maxi-dot. Doing 20 mph when display suddenly changed to show "speed warning" what does it mean? Have driven at lower temps and never seen this before. Car running perfectly.

Have you accidently setup the speed warning by mistake do you think?

I certainly haven't had this on mine, when the temperature is low. I have the speed warning disabled.

Nope. The speed warning is disabled - and it even shows when stationary

Winter tyre warning?

Nope, don't think so. I believe if that is set it should show "Winter tyres: max speed...mph". Mine just shows "Speed Warning"

Strange isn't it.