Lets say you have this cool castle surrounded by a mean moat. Then someday maybe you want somewhere for the kids to kick a ball around, or maybe you are getting pressure from the Castle Owners Association, and you decide to take out the moat and put a nice lawn in its place. Isn't it great? Look how luscious and green it is. But then, who is going to mow that thing?
The problem with posting pictures 2+ years after you took them, is sometime you forget some small details. Things like "what is this thing and where exactly is it." I thought it was on top of a museum in Trafalgar Square, but Google has not allowed me to confirm this. I can't deny it either. Maybe I should go back to London to find out. That is, if it does not get destroyed by aliens on Christmas. Again.
I don't remember anything about St Martin-in-the-Field, other than the fact that it is not in a field. I don't even remember this window, to be honest. I took this picture, so I must have seen it. I do somehow know that this is what the window really looks like - there was no Photoshop trickery involved. I don't even have Photoshop.