A couple of other books which typify some of the incredible flying that was done in the war in aircraft with minimal navigation aids.
'We Landed by Moonlight' by Hugh Verity is a history of the clandestine missions into France by the Lysanders and Hudsons from Tempsford.
'Bring Back My Stringbag' by John Kilbracken tracks his career in the FAA flying these supposedly obsolete aircraft on missions that nothing else could do - Atlantic convoys, Artic convoys and shipping strikes.
Both are excellent reads and thoroughly recommended as something a bit different from Spitfire aces and bombers to Berlin.
RD