Have a strange one for you all....
In reverse (only) a sound that I can only describe :confused: as the sound of a series of marbles dropping into a wooden box (no marbles in boot!) emanating from rear LHS only.
Clearly audible inside and outside of vehicle.
Only in reverse, only when cold, for as long as I'm in reverse (IE sound doesn't diminish the further you go in reverse) even when stopped in reverse.

Was thinking maybe handbrake, but it looks ok...
Was thinking exhaust, but that is <6months old, and all hangers in new condition, and not touching bodywork or suspension anywhere.
TJ S1 FWD 3.5.