Labour and the Historians - D. Tanner: Political Change and the Labour Party 1900–1918, Cambridge University Press, 1990, 469 pp., £45.00. - P. Williamson: National Crisis and National Government, Cambridge University Press, 1992, 541 pp., £60.00. - K. Theakston: The Labour Party and Whitehall, London, Routledge, 1991, 206 pp., £35.00.