Strange greyed mark on screen?

Hi,
I have just noticed a strange grey mark on my screen (I think it is similar to the ghost mark questions some people have posted).
It only shows up when the screen has a dark colour on it, but is only visible with the backlight on, and seems to disappear when I dim the brightness al the way down, see pics:
http://imgur.com/Vc9VxFf
http://imgur.com/6oyAptL
My macbook pro is out of warranty, and Im wondering if and how much I'll need to pay to fix this? (I'm in the UK).
Has anyone else had this problem?
Thanks.

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I wonder if anyone can help me?
I am very fussy when it comes to my gadgets and keeping them cosmetically perfect from new, so when upgrades come etc I am able to sell on at the best price I can get.
I have a 3G and have owned it for about 3 months. I have kept the phone is a Incase Slider since new to stop the classic apple scratches on the back and the bezel. (I can't understand why Apple use such bad materials that scratch almost just by touching them!)
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Has anyone else found any weird looking marks that are don't seem to be on the outside of the screen?
As I said above, I'm very fussy and try very hard to keep my iphone is perfect condition, I've never put it in pocket with keys, money, credit cards etc etc so I'm baffled as to what this strange looking mark is? It's also way to high to be an earing etc.
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Hi
Just recently noticed some dirty grey marks in my LCD, I say in because thats where they are.
These dirty marks are both blotches and streaks.
Areas affected are, bottom left, top left down to about a third way down screen and top right with a couple of small marks about an inch to inch and half in.
I thought they were behind the front panel and caused by the fans sucking in dust. Removed glossy front panel only to find these marks are actually inside the LCD.
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I did have the same issue, after 6 mounths of use.
http://discussions.apple.com/thread.jspa?messageID=6391812&#6391812
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