Is all this in addition to the already available blinking led in the car?
I know the GP has a blinking LED when locked
Yup - the more you tell Mr Lightfingers that your car will electrocute him before he touches it the better. A visual deterrent prevents him getting in to find out for himself
The flashing light on the vertical panel is feeble and not visible from all angles like the fascia top, on e.g. the Mini which sounds like it's where Luigi has put his flasher.
R-V-M