I have been searching for the dreaded creaking for nearly 2 months now, and its the DOOR LOCKS. How do i know well If you close and lock the doors then push down on the top edge of the door with one hand and gently lift by the door handle with the other hand you replicate the door movement as when the body flexes over bumps etc. You can hear the creaking noise coming from the striker/lock area. Spray the door seals first to eliminate them though. Now ive found it just got to sort it RING RING HELLO MR DEALER TYPE PERSON.