Armscor is the South African state organisation with the task of beating the UN arms embargo. Ulster Resistance is an equally shadowy paramilitary group formed by Protestant extremists in Northern Ireland. Last April, representatives from both sides were arrested in Paris allegedly negotiating an arms deal - the first sign of a secret weapons-trading alliance. Robin Denselow 's investigation takes him through France, Switzerland, Greece and Northern Ireland as he tells the story of two unlikely allies in arms. Producer TRICIA LAWTON Editor TIM GARDAM