I just want to pitch in and say its way too expensive for a A8.
There are several S8 D2's cheaper than this.
Also, the dead give away of a self levelling suspension is a larger than normal power steering oil expansion tank. If it has this then stay away, air suspension costs £ thousands to replace. (I am currently replacing mine, its leaking and rusted).
have a look on mobile.de and autoscout24.com
here are 2 random ones, could be lower spec but mileage is similar.
http://www.autoscout24.com/Details.a...000&asrc=st|fs
http://www.autoscout24.com/Details.a...000&asrc=st|fs
or, you could get this:
http://www.autoscout24.com/Details.a...000&asrc=st|fs