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I think they tried to address it but may not have had access to still living participants (edit) of the invasion of Poland after both German and Russian massacres (like Katyn).
The producer touches on that in the second episode (A distant war).
"Tells it very much from a British point of view, the title gives it away. There was nothing distant about the war in the Autumn of 1939 if you lived in Warsaw".
At 18 minutes into the program they have a Conservative MP (Lord Boothby) who states "We'd gone to war for the defense of Poland. In the event we did nothing to help Poland at all. We never lifted a finger."
Needing film stock from Russia may also have played a part.
If anybody wants a copy of the series PM me. I have kept it on the harddrive for years (20GB).
-edited.
While there is a lot that's great about it, there's plenty that is a bit iffy.
Just as an eg the episode on French preparation and the invasion of France is full of contradiction and inaccuracies. Overall it very much supports a Anglo-centric world view.
All that said, you've got to consider when and where it was made. The first hand accounts are deeply moving and should form an essential part of our collective memory.