James S. Corum. The Luftwaffe: Creating the Operational Air War, 1918-1940. Lawrence: University Press of Kansas, 1997. This will be a helpful reality check, as I spend so much time reading (usually greatly exaggerated) accounts of the capabilities and intentions of the German air force.
Peter Fleming. Invasion 1940: An Account of the German Preparations and the British Counter-measures. London: Rupert Hart-Davies, 1957. An early history of Operation Sealion (by Ian Fleming's older brother; he had the job of organising resistance in Kent and Sussex should the Germans invade). Looks like it has some interesting bits about popular (or at least press) reactions to the threat of invasion as well as the air war.
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