Right, back again with the lock. As I suspected, the switch is quite visible but is very much integrated into the lock. To get to it, so to service it, would require total disassembly of the lock. Given this thing is capable of locking your door shut forever then care is definately called for.
Rich, how old is your Freelander? For a guide, my locking system is basically worn out after 10 years. The clue is in the remote lock / unlock action. On a good lock the little widget on the top of the door trim should shoot up like a scalded cat. If your locks (like mine) are slow and cluncky then I really recommend that you replace the lock mechanism entirely.
I back this up by stating that the Freelander locking system encorporates an electrically operated but mechanical maintained deadlock, which render mechanical unlocking impossible. The release of the deadlock is the operation of the unlock solenoid. My solenoid linkage snapped on three doors within about 2 months, rendering unlock impossible by remote control. Fortunately I have disabled the deadlock from within the CCU (A happy accident as a result of a repair to the primary lock / unlock circuits). If I still had deadlock functions then my three doors would be impossible to open. I have read on here where an owner had to drill out the lock to the get the door open. Not a pleasent thought.
For cost guidance, I have just paid £70 not including VAT for the Drivers door lock. This is a genuine and new Land Rover replacement. Don't be tempted by uses locks unless you are really sure they are not worn out.
Good luck,
Dave