I am getting a knocking feeling through the wheel when turning I think it might be the steering rack/colum does anyone know if this would be roughly correct

 

when parked ie dry steering a rough/knochie feeling will be something along the lines of steering collum uj or seized top mounts when are you getting this driving/stopped and a little more discription on the feeling wouldnt go a miss...........

 

When parked turning wheel...rough knocking almost grinding noise....totally fine when driving

 

I'd check the Steering UJ as mentioned above, Might be fine with no pressure on the wheels but once the weight of the car is on them you'll feel it loads more. Its not a common issue but it does happen now and again that the joints go dry with heat

 

How do I go about checking the uj...is it a easy job