I have looked at the Turf region "Greater London" and found a couple of zones in Chertsey.
It seems like those zones are outside the Greater London administrative area.
The only reason I could come up with apart from them having the wrong region is that Turf is using the "Greater London Built-up Area" as its region.
Greater London Built-up Area is made up of Chertsey, and a number of other places inside and outside Greater London. See: http://en.wikipedia.org/wiki/Greater_Lo ... lt-up_Area.
"Greater London Built-up Area" has a very complex geometry.
I think that it would make sense to use the administrative area "Greater London" and place these zones in South East England instead.
Greater London
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