rotatinal n/s/f noise

[lawrence306]

Hi guys, just noticed this eve that my hdi estate has a weird rotationl 'whirring vibration' noise from the n/s/f... Thought the gearbox was on its way out but im sure its not that.
It gets louder as the speed increases and when i turn left it goes away but its still there when I turn right and only happens when the car is moving, it doesn't go away when i press the clutch either.
Suggestions?..... And no just 'keep turning left' haha