Protean is a grandiose word for reviewers to avoid; "variable, versatile, taking various forms", says the Concise Oxford. But consider David Lloyd George: nearly beaten to death for denouncing the South African adventure and Man Who Won the War; anti-imperialist and snapper-up of territorial bargains in 1919; Home Ruler and sender-in of the Black-and-Tans; land nationaliser and Surrey proprietor; Welsh Nonconformist and round-the-wicket adulterer; admirer of Keynes, admirer of Hitler; s...