This morning I started up my MiNI one 2004 petrol RHD. Instantly there was a horrible loudish noise coming from under he bonnet, as soon as I press the clutch down the noise stoped again when I released the clutch this noise starts again

Im no mechanic but the clutch was replaced 3 years ago (not by a mini dealership). The car as running fine last night and now its annoying me

Anyone got any views on what this could be?