Just to let everybody know that my local vw specialist has storted this problem by strpping off all the door trip and components and then smashing (not as bad as it sounds) off the door lock thus gaining access and then replacing the lock - one of the 3 lock motors in the lock will have stopped working - common fault apparently. A sign that the lock is on the way out is if the door will not shut, bouncing off when you try and close it !