Thank you for the info. yes a definite cluck but not a scrapping metallic sound so I am sure it is normal - I noticed it a 4am as I had the machine on a timer so it probably sounded louder than it was.
Lovely to wake up to fresh bread (diet goes out of window)
ours travells across the worksurface! Has never fallen off but the kneeding process certainly clunks and vibrates the unit a lot. So, normal. Make sure it is positioned as far from edge of worksurface as possible.