I've got water sloshing round in the passenger door of my Lag II also. The door has a rubber drain plug on the underside, and I have to routinely drain the doors from water. I look like a prat if I'm seen doing this.
Surely the doors shouldn't accumulate water in the first place.........hence the fact that they need to be drained manually, rather than a drain point existing but getting blocked up.
Any ideas where the water is ingressing, so I can possibly prevent it from entering in the first place.
Currently in Babyboaty's garage:
Laguna II 1.9dCi Dynamique