First, I was fixated on gathering both the National Gallery (left) and the St Martin-In-The-Fields Church (just right of centre) in the frame. And with a micro 4/3 you really don't have to move very far forward before things start drifting out of frame. Second, I was getting drenched and wanted to get out of the rain. Third, it was later than I would have liked. Fourth, I was getting hungry.

Put all that together, and you have me failing to appreciate the handrail that runs across the foreground of the shot. I suppose if I put enough work into it I could, perhaps, clone it out. The stair part would probably be relatively easy, but the part near the people under the umbrellas would not. Still, upon reflection I don't think that it is a huge distraction in the sense that it runs through the image rather than across it, and is below the starting point of both the National Gallery and the church.

Nonetheless, if I was there earlier, drier and before lunch, I probably would have swapped out the 12 to 24 lens for the wide-angle one and move forward to the other side of the railing. I kind of like the perspective of the church and the stairs seeming to lead over to it, though. Maybe that's just me.