When i start the car on cold starts and press the clutch down (whether i select gear or not) with the clutch pressed to the floor, i get a kind of whining noise. as soon as i lift it or come off it a little, it disappears. Doesnt effect gears or anything, car drives fine. And the noise is not gear dependent. It's only audible when clutch is pressed down. After a few minutes once car is warm (either after driving or leaving stand-still) the noise completely disappears. Any ideas as to what this could be?

Thanks