Video and sound of my latest cause of stress. Please help

Hi,

Right, ive been having an absolute nightmare since I have lowered my car. One problem after another, the latest of which is a loud and very worrying knocking noise which has everyone I have shown it to baffled.
Ive had the car up and cant see what would be causing it.

Leading up to this, I have had one quiet, single knock when turning or braking. I have also recently replaced the drivers side driveshaft. Threads to both problems here:

http://www.audi-sport.net/vb/a3-s3-...-when-turning-breaking-car-limp-mode-too.html

http://www.audi-sport.net/vb/a3-s3-sportback-8p-chassis/194243-have-i-just-shafted-myself.html


Here is the video:



The noise starts at about the 0.22 point. It knocks when driving slow or fast, it knocks when going over bumps and if I shake the car from side to side it knocks. So something is loose id imagine?
It sounds to me as if it is coming from the rear, it sounds to my brother like it is coming from the front, but its 100% coming from under the car.

Has anyone any idea what this could be?????



100 bonus points if anyone can guess what the other car on the drive is.



Thanks

Brill, ill go take a look now. Is it best to keep the car on the ground to check this?

Yea that was me, I sheered off the end as I didn't put it back correctly. I have replaced with a new one.

Looks like there is a fair bit of room around the arb, if im looking in the right place:

Drivers side front:




Passengers side front: