Hah, just had a look at that. I love the idea that it comes with a carry case. I appreciate cables are portable, but once it's in your hifi, does it need to be? Handmade? For that price I'd want some machine precision engineering, not some dude with a soldering iron putting my cable together.
Well, I think I got to the bottom of it. The cable coming from the TV into the floorbox is missing a pin at the floorbox end. It's marked up as Channel 0+ (pin 7) on this diagram:
That I'm not sure about. It could be a result of some rough handling, or maybe a manufacturing defect. Either way, it's needing replacing. Pic attached of the offending lead with a working one for comparison.
Edit - a prize for the person who guesses what body part they're squeezed between. :|