Basically just after advice - I've not paid much attention to LCD TVs in the past, but have been around LCD monitors a lot and I've not had this problem very often...
The issue is that when there is a dark image, the backlighting is noticable patchy. During normal daytime TV this isn't a problem but at night in a low-lit room, when watching a program with dark scenes (surprising how many of these there are!) it is *very* obvious.
To show you what I mean I've selected an un-used input - the TV displays a black screen, and I took a photo of this "black" screen.
Now I know that the black quality of an LCD isn't as good as a Plasma, so I don't need to be told about that :) Buuuut, I did expect it to be of even brightness (the same as my LCD projector).
So the question - based on the photo above, do I contact the retailer (Harvey Norman) or Panasonic and ask them to do something about it, or is this normal for LCD TVs?