A lot of the silk maps available are very old. The accuracy of the information may be dubious. SASS in Preston have a wide range, but I think they sell them more as collectors pieces. On a more positive point, although it would be bulky I wonder if we could convince the people that do those laminated OS maps to offer the 1:625,000 (UK in 2 sheets) in waterproof style?
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In the end, all you have left is style...