Dave, that is back lash in the whole front wheel drive system. There will be play in the CV joints and hub to CV joint splines etc etc.

Get it up off all 4 wheels and get it driven off the floor and make sure it's not the prop centre bearing or something daft.

Do you know about the long screw driver to the ear method? If not, touch the blade of a screw driver to the suspect noisy part and then stick your ear on the screw driver handle.