Bad news all round...
There's no obvious reason for the knocking...had a good look underneath. There were no signs of anything appearing to be loose, or rubbing. The drop links did look suspiciously weak and at an odd angle. So no closer to resolving the issue.
I think I will replace the drop links to see if this improves things...any recommendations? Presumably, the ARB clamps are to be replaced with OEM ones?
Moving on to the brake kit...to cut a long story short it basically fell apart when reversing out of the workshop. Believe it or not, one of the piston broke (not the seal) and leaked brake fluid eveywhere. I'm sending the kit back for a refund...had enough messing around. I won't be recommending Hi-Spec to anyone.
Some photos of how the kit looked (before it was taken off) along with the TTShop crew inspecting to see where the knocking may be coming from.
For the time being, I'm back to the stock brakes...the ones precariously close to the bin.
I'm now going for the RS4 brake kit - which is mega-bucks...but before parting with the cash is there anything I need to be aware of/or consider?