Still no response, strange as surely I cant be the only 7 series owner who is experiencing this?
Any way after some digging around and looking at other post on bimmerfest (e39, e46, x5, x3)and other forums, there are 2 possible causes to water gathering in the rear passenger foot well.
1 - a build up of dirt and gunk under the pollen filters in the engine bay, where water builds up in the pan and then overflows into the vents and through the vents under the seats.
2 - clogged hoses in the sunroof.
I have checked point 1, taken off the pollen filters and arm which is held on by a bracket on both sides. I didnt find any pools of water or any dirt build up (leaves etc)
The only other thing it can be is the sunroof and clogged hoses. I can see the outlets on the front of the sunroof but not the rears as they tucked away.
So my question is, does anyone on here know the exit points of these hoses as if they are blocked, I will suck out the blockage??