Thanks Neil, do you mean left and right filters for cabin? few weeks ago removed them to clean leaves and dirt and checked the drains, on sides. So i have to remove plastics bits further on each sides?

 

U need to remove the pollen filters, then the large plastic covers under them. There are about 8 plastic 13mm nuts IIRC.
These pull up to expose the brake master cynlinder and ECU box. The grommet under the brake MC is easy to remove, the one under the ECU is well hidden and not easy.

It's a good opportunity to clear out the drain points on the side, behind the front wings.

 

Mate,

I did this on weekend and like you said, the grommet under the brake MC is easy to remove and check. I poured water to insure and see with my own eyes where is this precious water leaking! Unfortunately its not leaking through this one. I am still to check one under ECU.
Because i live in NL you do not need to make a spell for rain, its just rains you know....
So i sat in Car put my favorite music (while raining) and waited. Strangely water came on left side by Trim panel foot controls. My door seal seam, front left very wet in the corner and Edge protection, door, front too. I just ordered these 2 new seals to replace, will see i this will fox it.