I.
It's not specifically Geographic.
Pauline
Yes I would agree with that but only partially, although gangs could
work on a particular style in different areas surely it would be more
usual for them to be working within their own area. or for a specific
style of wall to be usually found in a particular area.
The main thing being that the style of wall would point to a probability
(rather than a certainty) of being an area - with the idea of narrowing
the search area for the pic'.
Denn (not trying to be pedantic)