I think your spot on with the sensor on the back of the mirror.
The display was brighter at first this morning, so I covered the mirror sensor and the display went dark again. Sadly removing my hand again does not allow the display to return to normal.
Sensor looks ok and nothing obscuring it.
Not sure I want to be messing around with a replacement mirror and swapping the UEM over 6 weeks before my mot.
Think I'll concentrate on bits needed for that first.
Cheers.
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