How do you take the tailgate off the vectra?

Strip off all the inner trim of the tailgate. undo all wiring clips and remove as much of the wiring loom as possible. Then tape all plugs tightly to the wiring loom and pull the remaining loom bacwards through the tailgate at th point where it enters from the body of the car. Then unclip the air struts by removing the spring clips from the ball joint of the strut and pulling them off (tailgate has nothing holding it open now so use a broom or piece of wood to jam it open before doing so). remove the pins from the hinges or unbolt the hinge from the tailgate depending on how it is fitted. It helps if 2 people are doing the job.