Many readers are respectfully protesting along these lines:
Not a big deal, but I am virtually certain that submitter of the photo gave the wrong address. I agree with the poster whose image you included near the bottom of the column (it has red arrows). Double paned windows are located between 11 and 12 Moray, but not between 10 and 11. I'm sure this seems overly obsessive, but I'm sure I'm not the only one that gets a bit obsessive about this contest. Winning a book is irrelevant, I just want to find the correct window! It's just a fun contest, and you do a wonderful job. But the correct window is between 11 and 12 Moray – I'm 99.9% certain.
The most detailed breakdown of the disparity:
Let's start with the obvious: The window in the VFYW has a dividing vertical strut. The window named has a horizontal strut (not visible in the VFYW pic) but no vertical strut. But windows can be changed. So let's look for some more permanent fixtures:
As you can see in the VFYW photo, there's a nearly direct line of sight from the window to the lantern over a white patch on the flagstones to the house with the triangle-shaped portico. The problem is that it is just not possible to draw a line over these points if the window is the window named by the submitter.
Let's look at the white smudge first: As you can see in the VFYW photo, there is a white smudge behind the lantern (marked by "A"). Directly to the right of this is a single red-hued flagstone right next to the curb (B). There are five more of these in a irregular line leading to the right (C-G). There's also a bigger white smudge close to the houses (H). If one looks closely one can also recognize a red half-flagstone (I) (All in Flagstones.jpeg – Left Panel).
If you have a look at the right panel of Flagstones.jpeg, you can clearly see (D) to (I). (A)-(C) are unfortunately covered by the Jaguar. But at least (A) and (B) can be seen in the top-down view, where they have the same relative placement to (D)-(I) as in the VFYW image (All in Flagstones.jpeg – Right Panel).
You can also see that there are no comparable discolourations in front of either 10th or 11th Moray Street (10th and 11th Moray Street.jpeg).
The house with the portico is 22 Moray Place (Lines.jpeg Top Left Panel). The lanterns are to the right of the bridges leading to the doors of 10, 11 and 12 Moray Place (Lines.jpeg Bottom Left Panel) which I numbered 1, 2 and 3 respectively. If we try to draw a line from the window the submitter mentioned over lantern (2) we can't draw a direct sight line to 22nd Moray street. Instead we always end with a front view at best of the intersection (Green lines I and II in Lines.jpeg).
If we go one window to the left (not the window mentioned by the submitter but still 11 Moray street), we can draw a line to 22nd Moray Street but it won't cross anywhere close to the discolourations seen in the VFYW photo (Green Line III in Lines.jpeg). It's also unlikely that you would have the line (B)-(G) nearly in the middle of the photo instead of at the far right border.
On the other hand it is exceedingly easy to draw a line from the window to the right of 12th Moray Street over the discolouration and lantern 1 right to 22nd Moray Street (Line IV in Lines.jpeg). This would also place (B)-(G) right in the center where they should be according to the VFYW pic.
I don't really expect a "win". After all there were lots of posters who called the first or second window to the right of 12th Moray Street. But either me or the laws of optics are slowly going crazy over here.
The Dish 