[Moose850]

Thanks for your reply Mark.

I always keep the scuttle drains clear so I knew it was not them, also the carpets in the drivers foot well were not wet at the front beneath the pedals, nor to the right of the pedals. The only place that was wet was the right side beneath the small bin built into the door trim.

As I mentioned it appeared that the water was dripping off the door carpet onto the plastic threshold trim and running off that into the foot well.
I removed the door inner trim panel and confirmed that the door drains were perfectly clear front and back. The only place I could see a trace of wetness was on the door metalwork beneath the white plastic 'box' style insert which protects the back side of the door bin from water that drips down inside the door cavity.

I think water had dripped onto the white box and ended up on a small horizontal half inch wide shelf at the bottom inside edge which is all part of the box. It looks like the shelf, when in situ, has a slight incline which would make any water that collected on it to drip into the door cavity but if the car was parked on slightly uneven ground so the drivers side is slightly higher than the passengers any water running of the shelf may run back along the underside of the shelf and capillary between the bottom edge of the plastic box and the door frame it is clipped into. Once there it would soak into the carpet and then proceed into the foot well as previously explained.

At this point I am only surmising but decided to carry out a mod as though my conclusions were correct as I had nothing else to go on.
I put a small bead of silicone on the underside of the shelf about 2mm back from the edge, this should act in a similar way to a drip groove on the underside of an external window ledge and not let any water past it.
I also tried to reduce the amount of water falling directly onto the top of the box but fixing a 2" flap on the top edge of the aperture before I reinserted the white box. As the box was pushed into the door cavity the flap produced a sort of canopy over the top of the white box.

Everything was dried and put back. I am now holding my breath in anticipation for the next lot of rain to see if I'm barking up the right tree.

If anyone is interested but cannot quite understand what parts I am referring to or the mod i did, let me know and I will post some pictures.