Xk8 front suspension creaking noise - 2004 Jaguar XK8

indicates failed top bearing in the strut mount
By not turning , you are in effect trying to twist up the suspension spring and it is moving in the strut retainer causing the creaking
have it inspected by an accredited suspension or steering specialist shop

check the strut or top strut bearing for failure
the creaking noise can be from the spring being wound up from turning as the bearing has seized
have it inspected by a specialist suspension shop

Depends where the noise is comping from. If front side I would check brake pads first.

The famous Subaru Legacy Nissan...creaks in front suspension can be, in no particular order, and no particular model or make of vehicle, strut tower bushes, A arm bushes, anti roll bar bushes, A rm steering stops, etc etc.
if you have the solution to your particular problem please enlighten us, thanks.

Check the creak rings they might need oiling ;)

High probability that it is the strut mounts, they don't have a very high life cycle. Very difficult to test while mounted.Creaking might just be a dry suspension, but the bumping noise definitely good indication of those strut mountings. You could check if fastening them more on the chassis makes any difference. Quick and accurate diagnosis if you can drop by suspension people.

Is this a suspension creak, or a door creak?

Components which you haven't had changed are:

bottom suspension arms
Anti roll bar links

Also lubricate your door lock mechanism, hinges and window rubbers as these can cause creaks from time to time.

My wife drives a 2003 GMC Envoy and has been complaining about this same creaking noise upon breaking or going over speed humps. I researched this topic on the internet high and low and tried everything I read to no avail. I was about to give up and then realized it could be the motor mounts since when you break or go over bumps the engine does have some movement. Sprayed the most interesting looking motor mounts I've ever seen with silicone spray and the noise was gone! My wife has been complaining for years about this noise and now looking back what a simple solution!. By the way my motor mounts where not worn out, the rubber portion of the mount just needed a little lube.

Check the anti-roll bar bushes and also the end stops of the anti-roll bar

BALLJOINTS OR CVC JOINTS ?