Here are a few more urban camo shots in action, from a military website:
The colors chosen, grey, white, brown and black, resembled the shades found on buildings, windows and doors. Irrespective of the size of vehicle, the blocks of color are approximately eighteen inches square and were not scaled up or down for different vehicles.
Certain camouflage patterns are ineffective when close up or the target was in motion, but improve as the distances increase. In this case, 50 to 60 yards was the minimum, as you got further away the target almost disappeared at 100 yards.
Each vehicle was to be painted to the same pattern; the same size blocks of color and pattern would make it harder to determine the strength of the British Forces because they all looked the same.
The materials I'm reading seems to suggest a desert type camo pattern, on a moving vehicle, is not all that effective in an urban/traffic environment.