
Never noticed it before, sounds like road noise coming from the the rear right speaker grille.
I even double checked the windows were closed.
Was almost going to stop and have a look outside, half expecting a flat tyre.
The only difference is i temporarily removed my anti scuff pads on the seat belt (resprayed them black as they have faded) and have yet to refit.
Having removed the grilles a couple of weeks ago there isn't much in the way of open space with the speakers in there.
Only other gap is where the seat belt retracts.
Bit of mystery, of course day before i take it in for mot.