In August 1940, as Hitler prepared to invade Britain, a top secret mission designed to turn the tide of the war was under way.

A team of Britain's top scientists and engineers were on their way to America.

They carried with them a briefcase containing our most valuable technological secrets - to give them away.

Stephen Phelps tells the story of one of the most secret diplomatic missions of the Second World War and of the post war consequences of this extraordinary gamble.

Broadcast Dates

  • 20070205
  • 20070801