Britain covered up WW2 "plot" to kill Polish PM By Peter Griffiths Mon Sep 4, 2:00 AM ET LONDON (Reuters) - A distinguished Polish pilot who said he found a bomb intended to blow up the plane of Poland's wartime leader admitted to lying but the episode was hushed up by Britain's government, secret files released on Monday showed. The apparent plot to assassinate General Wladyslaw Sikorski, who led the Polish government in exile until his death in 1943, sparked a big inquiry with suspicions it was a German or Russian conspiracy but it turned out the pilot took the...