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@ColinNorthway i think if you see it in context (here is map <lean to the left> here is mapped) then up-is-forwards is best
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@ColinNorthway a little compass rose on the maps themselves helps give a cue to those who did not know either way
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@ColinNorthway and one tiny feature you can steal from the TfL miniliths - the base of them has a small compass rose pointing north too.