condensation
you definatly have a leak its the only way you have condensation i know had lots of it, maun areas to check are the door seals front and especially the rear door also behind the consol to the left of the clutch pedal there is a seam that needs a bit of mastic squeezed in the gap check your floor carpet for water i bet you its wet, one thing that helped me was if you knoe anyone with contacts in the haulage industry ask them if they have any of the wee bags for condensation that they put in the back of the containers, they come in all sizes i have about two in the boot of my terrano 2 works great well helps a lot, every now an then all you need to do is take them out and put them in a hot cupboard to refurbish them eg dry them out, hope this helps m8