Started getting a mechanical knock from the NSF area so after researching the issue on here, decided to check the ARB bushes, spring and droplink for that wheel yesterday. Jacked up the car, removed the wheel and started to give everything a good waggle to see if I could find anything obvious. Nothing apparent so put the wheel back on and lowered the car. I then removed the front bumper to fit a front & rear park assist system and found the OSF horn was hanging by its cable so resecured it. Once the the parking sensors were fitted I reattached the front bumper. Now, here's the strange bit.... when driving to work this morning.... no knocking whatsoever!! Could it still be the usual culprits and jacking the car up temporarily fixed the problem or could it have been the lose horn on the OSF transmitting the knocking noise to the NSF?