If I can throw my thoughts in.
When you push up the open lever and release it, can you hear the actuator being pulled down, and sliding back up again?
Because it will not let you close the window, it thinks the door is open, so all seems to be doing its job, and seems to me like the micro switch on the lock that tells the ccu if the door is open or closed has failed, and is telling the ccu the door is open. Known this before, not on Freelander, but the principles and design are the same.
The only reason the ccu would think the door is open is because the lock micro switch is sending a message saying so
Beats the hell out of me why the FL has no interior lock handle, I personally have never known it. When SWMBO bought a Freelander, I had a trawl of the web, and read about the back door lock failing and not being able to open it from the inside. 'Nah, that can't be right', I looked, and sure enough no interior door handle or manual release. Sod that, about a hour later it had a manual door unlock cable in the door pocket attached to the lock lever above the actuator.