First thing I checked.... all the lights are working.
Used her today for a long trip to our operational site. On the way back I hit a very heavy storm for some 50km. Somewhere in the middle of this, the beeps disappeared, or so I thought.
Stopped for a coffee, started up, yup, you guessed it, beeps are back.
In fact, now when I turn right, I have not one but TWO distinct beeps. The first comes on with the indicator and then mid-turn the one from the right rear pillar chimes in at exactly the same tempo. Absolutely amazing!
Also, I checked the display and specs on my car. It is not fitted with ACC, which would have been another possible culprit.