Breach of Promise: Labour in Power, 1964-70 by Clive Ponting
This account of one of the most crucial governments in Britain's post-war history is based on inside accounts and previously secret American documents including correspondence between President Johnson and Harold Wilson. It throws new light on the policy of the government and reveals the dependence of Labour's economic and defence policy on the US together with the deals struck with the Americans that were kept secret, even from the cabinet.