There are 4 drain tubes on the Saff. The front ones are normally okay, so I would go to the boot and behind each trim panel is a drainage point which runs through the air vent on the pre 1991 models and into a collector on the post 1991 models.

Chances are this is crapped up where it leaves the car in the boot. Water then backs up the pipe and collects in the sunroof aperture, draining into the interior light when the level gets high enough.


Be thankful it is blocked, I know many people who have had the drains come loose and pour water into the boot when it rains.