[maple_leaf_eh]

Poland lies between two really despicable neighbours and two variable friends (Germany and Russia [give or take a few republics], and Austro-Hungary and Scandinavia). It is their lot in life - so much that LOT is the national airline. The know more about their region than most of us know about our pockets. They have naturally decided who their true friends are; and they have chosen to share some of what they know with the British. These relationships go back many decades, predating WWII. Apparently very early in the war, they captured an ENIGMA and knew that it could not be used to its fullest advantage in Poland. Hence their sharing it with the British.