After checking my files for my essay on the reliability of TICOM reports i rediscovered a British report giving an overview of Polish codes. The British codebreakers obviously had some success with the codes of their close ally!
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You can download it from my Google docs or Scribd accounts.
This report is important because it verifies the use of a stencil subtractor system on military attaché links, just as the Germans said.
The title is "Polish Cyphers 1942-1945", write-up by Jones-Williams (Berkeley St.)and it can be found in collection HW 47/2 of the British National Archives.
