The position of the wheel is defined by where the holes for the bearings are bored in the swivels so there's not much you can adjust. On our old Triumph Spitfire you could shim the wishbone brackets out from the chassis to adjust the camber, but it doesn't work on Land Rovers sadly. Maybe you've got an odd (Britpart) ball where the tolerances are a bit lax. A millimetre or so at the swivel would make a noticeable difference at the edge of the tyre. Or maybe the axle casing has got bent. Or maybe it's not the wheel but the rest of the Land Rover that's at a funny angle.
Another issue is how level it sits on its springs. With some (but not all) spring kits, the driver's side is slightly longer to accommodate the weight of the driver, so when the car's empty you might find the driver's side slightly higher.
