On 12/08/2014 16:46, whisky-dave wrote:
...
I heard that in certain areas sich as docks german spies had submitted moire detailed maps to the Gernams than the OS maps did to our maps.


In which war? SFAIK, German documents confirm that in WW2 we intercepted
and either executed or turned every spy the Germans sent against us.

--
Colin Bignell