My 2006 Vti has recently developed a loud creak in the LH (AFAIK) rear.

I thought it may be interior trim so sprayed the edges on the hatch with silicone spray with no change. I also wiped the buffers and the hatch seal with Armor All.

Had a brief look at the suspension but the shock bushes all looked tight and no noise when manipulating .
Has anyone had this problem and what is the cure?
I have searched and there are no posts pertaining to rear creaks and groans.
Regards Philip A