I have the same issue.

Have done

new topmounts
ball joints
droplinks
arb bushes
second hand steering rack
And just fitted second hand steering column

(this has helped as the old adjustable has play in it)
However still have some noise.

I've even looked at the pushrods on the popup lights and changed the power steering pump rubber bushes.

Also tried tubing around the coils to stop them hitting each other

Car has apex springs but the previous G max ones also did it,can only hear it at low speed 20mph.

May try new inserts and or drumsticks and track rod ends.

Have been underneath so many times and had the front sussys off,well I've lost count.

This is a link to youtube showing

(hearing the noise my column had)
http://www.youtube.com/user/Toecutter12

Would love to totally fix this.
