The study is based on unpublished documents of the National Archives in London and deals with the perception of the so-called Machnik’s Decree from the point of view of the British Legation in Prague and the Foreign Office. The so-called Machnik’s Decree means the appeals of the Czechoslovak Ministry of National Defence from January 1936, addressed to various enterprises who were interested in state contracts. These contracts required the trustworthy persons only. Both British Legation and the Foreign Office found such activities inappropriate and understood them to be useless. The whole affair, which was discussed on the field of League of Nations, helped the Sudeten German Party to gain publicity on the international groun.