How to check whether the A8 is a LWB or not.

[allaheadfull]

Silly question, but without actually seeing the car in the flesh, how do I know if the car is a LWB version?
I know it should have the badge on the back (A8 L) but if that is missing is there an easy way to tell.
When I had a Phaeton LWB - all the LWB models had a sunroof, and the climate control in the rear between the seats was present (not in the SWB versions)
As I am in the market for one, it would be good to check from the pictures, before going to see one.
Many thanks,