GRAAAHHH!!!

After many hours of searching/testing , and dismantling half of the cabin + trunk contents - main culprit of incesant rattle was the metal hooks (on the LHS) that hold the rear seat backrest to the interior. Solution - good 'ol sticky felt. Hopefully this thread saves someone else a lot of time.

Other contributing rattle points solved:
- back of rear 1/4 panels broken clips.
- rear 1/4 panel courtesy light wire fits to back of panel, the clip that holds this in place may be broken.
- old unused 1980's cell phone cabling.
- previous owners kids metal toys bits.
- loose seat belt anchor points.
- worn trunk seal causing excessive movement of trunk lid. ( new seal on its way via BMA parts ).