Noise from front wheel?

I have a rubbing/knocking noise from the front o/s wheel when slightly turning left, the Main man from renaults!!!!! said after he drove it " yes mate it is the bearing" so off I go to get a bearing, really good mate took the old one out and said there is nothing wrong with this one, so we fitted it and guess what, yes the noise is still there the car has just had a mot so the ball joints ok, the o/s engine mount seems to be a little loose, and after reading some comments other motorists have said this is the problem. Could any body offer any help as this doe's get a bit frustrating. Thanks