Thanks for that (even though it's not the answer I was hoping for).
Like yours, mine is electrically adjustable and appears to have the temp sensor.
I am expecting to collect my Multipla today, after a clutch replacement, so this is an expense I can do without. For the short term, I will remove the mirror and electrical cable - maybe I can figure out a way of making and fitting a new internal component. There isn't much give in the mirror unit, if a drunkard bashes into it, so this is likely to happen again, because we live on a route for drunken idiots going home from the pub.