passenger footwell full of water!

Hi All,
I'm a man in need for some help.
My 3.9 300 disco passenger side footwell fills with water when it rains, I've narrowed it down to the drain hole between the recess under the windscreen (where the wiper motors are) and the passenger side wing. I've poured water directly in the drain hole and 25% of it enters the footwell.
Could this be a loose grommet, and has anyone else had this prodblem and knows a way to fix it?
My only other option is to put it an a ramp but time is money lol.
Thanks,
Discorover :fighting2:

Ps. I've just siliconed in my whole windscreen so it cant be that lol

I have just spent two weeks trying to resolve the water in the footwells on my 95 Disco 1.
I stripped the interior of all carpets, underfloor soundproofing, seats, A post kick panels and the under dash panels. Hose on the bottom corners of the windscreen/top of the wings produced lots of water inside the car.
Next stage was to unbolt the front wings and see what was behind them. I had seen pictures of completely rotted inner wings and A posts.

There was some corrosion and after prodding I found a couple of small holes on each side above the horizontal bracing bar which runs from front to back along the inner wing panel. I also siliconed the whole of the vertical seam where the inner wing meets the A post. Water was also getting in through the top of the seam just below the bottom edge of the windscreen on the driver's side. You will only see this seam with the wing removed.

I am still not 100% sure that I have stopped all of the water ingress, so have left the carpets out for a couple of weeks.
I am confident that it's not the windscreen as that's what we do for a living.

Sun roofs can also do it, if a you have one, and b if the the drains are blocked, or missing

Thanks for the replies
Yep the sunroofs are another point of repair, managed to identify a single leak using a glass of water poured into the drain hole into the fender.
Fortunalty the discos been in a garage for most of its life and im hoping rust isnt an issue. I'm wishing its a loose grommet.
Next job now is to service the sunroofs.
Cheers