TD4 Hardback Annoying Rattle

I have a 2004 TD4 Hardback. There is an annoying rattle coming from somewhere in the back sounds like its inside the car. It could possibly be a loose catch is sounds like two pieces of mettle tapping together. Has anyone had this or have any idea what it could be as its driving me mad....

The only way to source that is to jump in the boot and get someone to drive you around. Wiring looms/relays behind RH side boot panel trim can become loose and rattle.

But difficult to tell, could be anything. I have stripped a FL commercial to fit seats and cant think of anything obvious that would be loose.

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