I have a deep rumble from deep inside the VX ... mistook it for tyre noise at first but that certainly isn't it. Seems to come and go a bit, but it is hard to tell with ambient noise.
I suspect it is BAD news but perhaps there is a magic known cure....
Ross
My first guess would be wheel bearing, & if past experience counts for anything, I'd guess rear axle.
Especially if it sounds almost like distant thunder.