Driving home tonight I happened to notice that the Alarm LED in the door was permanently on as I was driving. I can't remember ever seeing it on like this before, or whether it was on permanently when I unlocked the car

. When I stopped and locked the car, it reverted to the intermittent flash, and when I unlocked it again it wasn't on. Anyone seen this behaviour before and know if it means anything (like the alarm had gone off or something). Ta