Theres probably a gap between the top of the rear door and its seal !
My rear floor was wet, and i noticed one day, after washing it, that water had entered from the top somewwhere, ( not the roof ). Got inside the back and noticed about a 6mm gap.
I adjusted the top hinge in a bit, and it hasnt leaked since. ( no wonder Landrover went bust ! ) Poor workmanship at the factory.
Del.
When did they go bust?