Hi
On the 3 door, if you get in the car, lower the rear seats, there is a horizontal slot about 3ins long in the boot trim panel.
Put your ignition key into this, and slide one way or the other (can't remember which way) and the lock will open.
I have a 2005 3 door 2.0T and have had to remove the door trim to sort out a leaking rear wiper motor.
Hope this helps
voxy53