Documentary investigating Britain's clandestine support for the Nationalists and General Franco during the Spanish Civil War, through fear of the democratically elected left-wing Republican government becoming revolutionary in nature and being backed by the Soviet Union, and through fear for British business interests in the country. It shows how Britain caused major problems for the Republican side through economic and diplomatic cunning, and effectually aided the Republicans' downfall and Franco's success, although in a less obvious way than the German and Italian armed aid.