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That and the fact that the trigger for Britain declaring war was the invasion of Poland, we essentially went to war in an effort to protect Polish sovereignty,but come the end of the war Britain was forced to allow Poland to essentially be controlled by the Soviets. Something that did not sit well with Churchill or many of the other key players in British political leadership. Despite this the treatment of Poland post WWII was swept under the carpet in the UK for a long time it's only in the last 2o years that this has become acknowledged at all let alone widely, outside of the polish community in the UK and some academics.
Not much on the Poles either, it was claimed there were zero leading interviews with Polish people the entire series.