Complicated explanation - I live on a private road and for the last couple of months there has been a car parked up against my front wall overnight several times a week. Mine is the last house along our road, it then becomes unpaved and is garages and gardens for the houses on the parallel road. I believe (know) that the owner of the car is visiting the house whose garage is next to my drive. Their garden runs alongside of mine.
This car is always parked right up against my wall on top of my lavender plants. Since it first appeared I have become increasingly annoyed and now HAVE to do something, but what? AIBU to leave a tactful/angry note on the windscreen?