Rear right hand cubby hole. Big plastic box thingy....

Click image to enlarge

That'll be the subwoofer. Big plastic box with two big bass speakers in it, but you probably can't see the speakers because the trim is in the way. I thought it was in the left side, not the right (left standing at the rear, facing the front). Current: 2010 Range Rover L322
Vogue SE, TDV8 3.6, Bournville
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Now gone: 2002 Range Rover L322
Vogue, TD6, Giverney Green

Thanks Steve. Oops, yes you're correct, it's the left hand cubby looking into the boot  2017 4.4 SDV8 Autobiography
2012 4.4 TDV8 Westminster - Gone, but not forgotten