Robert Wohl. The Spectacle of Flight: Aviation and the Western Imagination, 1920-1950. Melbourne: Melbourne University Press, 2005. The long awaited (by me, at least) sequel to A Passion for Wings, this looks to be equally wide-ranging and is just as gloriously illustrated. There's a chapter on aerial bombing, though it seems to have little on Britain prior to the Blitz.
Kim Coleman. A History of Chemical Warfare. Basingstoke and New York: Palgrave Macmillan, 2005. Looks to be an up-to-date overview of the, well, what the title says, right up to the current day. There's a decent section on gas bombing and the fear thereof between the wars, which often seems to be neglected.
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