Spoiler

 

2019 Kodiaq - a musical tinkling noise when ignition turned on, with or without engine and continues until several seconds after everything is turned off.  Noise is independent of sound system,  fan, AC etc.

I have found it - it was the dashcam making a continuous warble sound after the start up beep.  Continued after a reset - now removed and peace reigns!  The sound was very hard to localise but is now resolved and I feel foolish and apologise for having brought it to the forum.