Coalitions, as David Cameron has discovered, are tricky things to manage. How much more difficult, then, was it for Winston Churchill as he struggled to survive, then win, a world war, while at the same time managing his fractious three-party administration at home.

In this scholarly, yet grippingly readable study of the wartime coalition, Jonathan Schneer, an Anglophile American academic, reveals how much of a myth the popular legend of a political class and nation united behind their belligerent war leader truly was.