This is a common problem in Freelanders. Things to check:
1. Is the rear cubby hole damp? If so, drill a hole in the cubby hole, remove and refit, clean and silicone-grease the rear seal. If this doesn't improve it, cut a section out just above the corners.
2. Is the passenger side footwell damp? If so, this is probably the heater matrix.

Fit a dehumidifier below the front seats but make sure it doesn't turn over and leak everywhere, like mine does! Clean the inside of the windscreen and use rain-x.

I've found a massive improvement by doing some of these small things.

hi , i have the same problem on mine (2001 td4) . the only thing i have found is the cubby hole in the boot keeps filling with water, i assume the rear seal on the window has gone , not really checked yet. i didn`t think that this would make that much condensation but after i`d wet vac`d it out and we had no rain it stopped. it`s def worth a look.

Hiya, as said this is a common fault as the design is poor and the seals are rubbish. drill a small hole in the cubby box and refit the seal and it should cure the problem.