Although in November 1939 he became a member of the Czechoslovak National Committee founded by Beneš, and in July 1940 Osuský was designated a minister of the Czechoslovak government in exile in London, his relations with Beneš were deteriorating.
Obwohl Osuský im November 1939 Mitglied des tschechoslowakischen Nationalkomitees von Beneš und im Juli 1940 Minister der tschechoslowakischen Exilregierung in London wurde, verschlechterte sich die Beziehung zu Beneš.