Drivers pillar wet
 

Hello! Long time since I called in, what with one thing or another. But I've popped in from time to time, but not found this particular problem so thought I'd ask here.
The drivers pillar, between the windscreen and the side window, appears to be getting very wet when it hoofs it down with rain. I pulled the cushioning away and it's inside the box metal but it's a square that I can't see into so can't see if there's an hole anywhere. I thought it might be the windscreen but I've read they are bonded in so don't know if this is right or not. I also heard it could be the sunroof plenum, but I would have thought that would leak lower down?
Any suggestions as to what it could be or the cure? Not been able to find anything on this, but then I don't know if I used the correct search parameters or not, so sorry if it's a common thing that I missed.

Thanks in advance, you lovely, knowledgeable people.

Do you have a sunroof?
Rev

Yes. I have a sunroof, which is where i thought the sunroof plenum may be blocked but I shoved a cable down and it didn't seem to solve anything. I looked at the windscreen and there is a break in the chrome right about where the leak is, BUT, that doesn't mean that's responsible for anything, hence my quandry.

The dry weather has meant this water ingress has not been an issue. However, it rained a lot last night and the inside of the car was wet. I had left the sunroof open on the up position so it had rained in, but it did remind me of the pillar issue. I tried to rod the sunroof plenum but I don't seem to have anything thin or flexible enough to get any length down the pipe. Any suggestions? Could it be that drainage pipe?

Thin length of curtain wire to rod it, but be very gentle as you can actually dislodge it at the top, and/or the bottom. Then it will definitely leak in!