https://historybyhollywood.com/wp-content/uploads/2018/07/34-the-battle-of-britain.mp3

For Your Freedom and For Ours: The Kosciuszko Squadron by Lynne Olson and Stanley Cloud

https://www.amazon.com/Your-Freedom-Ours-Lynne-Olson/dp/0099428121/ref=sr_1_1?ie=UTF8&qid=1531121894&sr=8-1&keywords=for+your+freedom+and+ours

Also known as A Question of Honor: The Kosciuszko Squadron by the same authors

https://www.amazon.com/Question-Honor-Kosciuszko-Squadron-Forgotten/dp/037572625X

The Trail of Hope: The Anders Army and an odyssey across Three Continents by Norman Davies

https://www.amazon.com/Trail-Hope-Odyssey-Continents-Military/dp/147281603X/ref=sr_1_1?s=books&ie=UTF8&qid=1531122031&sr=1-1&keywords=General+Anders

No Greater Ally: The Untold Story of Poland’s Forces in WW2 by Kenneth Koskodan

https://www.amazon.com/No-Greater-Ally-Polands-Military/dp/1849084793

Prisoners of Geography by Tim Marshall

https://www.amazon.com/Prisoners-Geography-Explain-Everything-About/dp/1501121472/ref=sr_1_1?ie=UTF8&qid=1531467071&sr=8-1&keywords=prisoners+of+geography+by+tim+marshall

Battle of Britain: The Making of a Movie by Leonard Mosley link and extracts, courtesy of listener Brian Willits: