This would appear to be a later photo taken from the block opposite. Note again that the street lights are of the old round globe type which existed in 2007.
Also noteworthy is the new floodlight erected to the rear and above 5a after Madeleine disappeared.

Excellent John. Thankyou for that photo, taken from the very balcony on the side of block 6.
As you can see, there is a gap in the trees and clear vision to immediately in front of Madeleines window and also to in front of the porch area for the front door.
What a great spot that balcony was to view everything and to direct the abduction.
Tiny flashlights could be used to signal from the balcony and vice versa. Tannerman could see the watcher as long as he had not stepped back into the shadows. Step forwards and the watcher was illuminated by the lamp, step back and he was in shadow.
The watcher could see everything as it happened if the light was good enough, but I am not sure about that. On the other hand light was streaming out of the entrance hall to the other apartments. Tannerman and his accomplice would have been silhouetted against that light. So hand signals might do