So i tried your idea with the tape and all looks clean. Also checked new lower arms for any flaked paint or dents, clean as well. Then had the space doubled checked when the car was on the ground ( not jacked up ) and there seems to be about an inch or so clearance between the lower arm and the arb.
I have been advised my shocks could be on their way out as i'm getting the knocking from small bumps when driving along as appose to speed bumps etc.
Any thoughts???