Hi Stephan,
I haven’t ‘solved’ it, but I spoke with the original owner and he said it started making the noise when the rear airbags were fitted, which are aftermarket ones. I will get them to check bushes etc next time it has a service, but suspect it’s down to those and I won’t be changing them.
Any similarly with your situation?
I am experiencing a very strange noise, specifically when the suspension drops suddenly (driving off a speed hump or going over a crest). It makes a very quick 'Whup / Whoop' noise, it seems to be coming from the front but seems to move from side to side. It does have the allroad air suspension, does anyone have a similar experience?