This might help others?....
I've had a front end clunk for about 6 months now and I've crawled underneath a few times and gone looking for it but couldn't find the cause.
The clunk happened when turning (changing direction) and on any bumps/potholes in the road.
I finally systematically went through the front end and came across the sway bar rubbers located below the bumper, everything felt reasonably tight but on the off chance i bought 2x replacements ($8.00ea) and fitted them.
When i removed the old rubbers they appeared okay with no real sign of wear, but when i installed the new rubbers the "clunk" disappeared.
Now my Disco has ACE so it pretty much gives the sway bar a thorough work out all day everyday and with the location of these rubbers i imagine they fill up with all sorts of gunk and just grind the rubbers away.
So if anyone has Active Cornering, its probably a worthwhile job to replace these rubbers, they are cheap and its only a 15 minute job to swap them out.
I hope this saves someone some time