theres lots of things to check here.
with the car on the floor:
1) wobble the wheel vertically, from top to bottom. if theres knocking there, could well be the wheel bearing (but will be cheaper and faster just to replace the hub)
2) wobble the wheel horizontally, from front to back. if theres movement, steering tie/track rod ends are worn
3) if theres both, it could be the swivel joint that the hub attaches to the wishbone with.
4) check the driveshaft nut. this has to be done up really tight and can work loose (131lb ft)
jack the front of the car up and check:
1)wishbone mounts for tightness (40ish lb ft) and bush wear
2) drop links for tightness (12lb ft) and bush wear
3) ARB mounts for tightness (40ish lb ft) and bush wear
4) tightness of strut to hub mounts (75lb ft)