Quick update...
Dakota bomb used again. Fail
Fabreze. Fail
Tried another odour make. Fail
Washed and cleaned carpet; cleaned and treated leather; slight difference but still strong
Changed all cabin and filters again
Enzyme stuff in there now to see tomorrow.
So in summary I have used all the popular products, cleaned loads and still no luck.
Headliner cleaned more than I'm happy with now, worried the glue will fail.