No, i dont have a sunroof. I thought i found the problem last week when i found the pollen filter cover had a crack in it, which lead to a saturated pollen filter and water coming in through the vents. Replaced both of those, and that part has stayed dry following the wash this morning.
I dont think its anything to do with the rear wiper as i havent used that this morning, i've been chucking buckets of water over the car to rinse it, and that is where the water has come from....BUT FROM WHERE I DONT BLOODY KNOW!!! ARRGH!!