Very frustrating issue, thought I'd solved it but it seems not. Having some 'knocking' noise (very metalic sounding) coming from the front I think.. It's quite a fast knocking noise, almost like a vibration. No steering judder or weird handling when it does. (always hard to tell but I'm 90% sure it's from the front and on my side) only on rough road surfaces. Not on humps, just when the road is uneven.
So usual suspects were front bushes which after inspection were indeed truly knackered. As I took them off as I noticed my driver side front ARB sleeve had massive cracks in it! So I though right I bet that's it... So after finally replacing the front ARB (with an OEM one which they've changed the desgin, has no sleeves now) and front bushes it certainly helped the problem. But it still knocks! Had it checked and there's nothing obvious that's wearing, anyone had a similar experience which wasn't the ARB or bushes? Dam flipping S3, can't afford to keep doing this! Guess it's 9 year old suspension starting to give up!