sounds like one of the rollers in the spigot bearing has collapsed... ??
as for that gear rollover thats crap, car idles ok?
if it what u think it is, a "throw out bearing"/"thrust bearing", box has to come out, id get the manager to get in the car with you and go for a drive.. when it gets written down on the RO the technician looks at it, gets in the car, puts it in his bay, plays with the clutch, and says normal... Its different when the manager hears it in the car with you..
my guess is spigot bearing and thrust bearing.. its noisy cause its not got pressure against it between the fork to the pressure plate, so once u press the clutch in, its got pressure on it, then noise is gone yeah? so when its lose it rattles like a mofo..
get it fixed before warranty goes..