Yes had the wheel alignment done, and it was ok after the work, this has started awhile afterwards,
It doesn’t knock at all,
It doesn’t move where it meets the subframe but I was thinking possibly where it meets the hub
It is a ball joint on the hub end of the lower arm, the upper arm is a bush both ends.
 
I'd put my bet on a inbalance of wheel diameters around the car or a tyre that goes out of shape Tyres are the main culprit. Had this on my old rangie and disappeared when I had new tyres all round. If your front tyres are slightly smaller than the rear then you will get a wobble generated through the car.
 
Ok so turned out to be a small amount of play in bothers inner tie rods but mainly the lower control arm bush was completely free to move around inside the arm, could barely detect the movement while manually moving the wheel but once driving was very obviously an issue, cheap easy fix thankfully
 

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