It sounds like you have figured out the water leak routes to the door sills.

If by chance you every get wet carpets on one or both sides of the transmission hump, probably in the summer during a hot dry spell, it is most likely one or both drains from the heater/AC box. The rubber hoses off the box that drain out either AC condensation or rain water in thru the cowl have slipped off their nipples and the water is instead of draining thru the floor, is now draining onto the floor.

The jpg re the first link shows the corrugated rubber bit above and to the right of the gas pedal that is the drain hose that goes down thru the carpet and floor sheet metal.

While it is bit hard to figure out from the jpg above, there is a rubber "strap" attached to the top of the corrugated hose that one uses to pull on to drag the hose up back around the black plastic heater "pan" drain. The same drain hose arrangement is on the other side as well.

One could I suppose run a plastic snap tie around the vertical pull strap if one was concerned about the hose slipping off again. See also the other jpg sketch which is from the Land Rover manual.

http://www.disco3.co.uk/gallery/albu...inIMGP0698.JPG

This link is a LR sketch showing the hoses on both sides of the transmission hump.

http://www.disco3.co.uk/gallery/albu...in%20tubes.jpg