Hello, sounds like the clutch thrust bearing making the noise from the symptoms you describe. What's the mileage? Assume the clutch doesn't slip or judder under load so the friction parts and flywheel are ok?
Someone more familiar with the model than me will know more I'm sure, but I would replicate the noise to the garage if at all possible during the warranty period to see what they suggest. Replacement of the bearing is a big job involving removing the gearbox if that's where the noise is coming from so you'd want to make sure.
Hope that helps a bit
