Four power conference to discuss rehabilitation of Danube States meets in London . The four power conference presided over by Mr Ramsay MacDonald , the British Prime Minister and composed of representatives from Britain , France , Germany , and Italy , met at the Foreign Office in London to discuss the proposals for the rehabilitation of the Danube States . Left to right : the German Ambassador , Baron von Neurath , Herr von Buelow , Mr Runciman , Sir John Simon , Signor Grandi , at the Foreign Office . 6 April 1932