Cheers fellas, bit of an update!
I BROKE IT ALREADY.
2 Days of these wheels on it, driving it low. Well, discounting when I had the MAM's on it. First casualty is a lot of the underneath, random bits of plastic hanging and bits I've had to rip off. But the main one is a suspected driveshaft. Gearbox end. These do go, pretty common.
Knocking started on Sunday, although fairly faint. I thought it was some chunky plastic bouncing off the floor. Didn't really mind, I'm used to the dog bone mount taking chunks out the floor. However, come monday morning on my way to work it started to get louder. My colleague and I agree'd it was drive chain related, seemed to be under load (Accelerating and decelerating). Fast you go the faster the KNOCK KNOCK KNOCK KNOCK noises. Will strip it down at the weekend, but for now, I'll be getting a lift in a friends Alfa. The irony.