im having EXACTLY the same issue Welshbob on the off side too..
thought that bearing would be noisy all the time not just turning right??
replaced front discs & pads and had cv joint packed with grease and its still there!!
it sounds like metal rubbing on metal as though the wheel is catching some where ie hub but not sure..
going back to garage in morning
grrrr! 
I am no expert but I would expect a worn bearing to make a noise all the time and not grind but rumble, when I test drove mine it had a huge rumble which was a bearing gone and it was changed. I think my problem will be on the near side as that side is loaded when turning right, I am no mechanic though so may be wrong lol
Metal on metal is exactly the noise like something fouling the brake disc but nothing is. Does yours do it every time? I find with mine sometimes it is quiet and some times awful. I have a suspicion that its a CV joint, I could have sworn I heard a slight clunk a couple of times when engaging reverse which is an indication of a worn CV joint. Also I think I can hear a faint grinding noise in a straight line now but I would not put money on it lol.
Its really annoying I know and especially when you take it in and it doesn't make a sound so the garage cannot trace it. I dunno how much the sound can be heard outside the car but as you know it sounds bloomin awful inside.
Let me know please what you find out as will I.
