This thesis analyses the British official attitudes and the gradual change of British policy towards Hungary and Hungarian revisionism in the period from the Anschluss in March 1938 to December 1941, when the British government declared war on Hungary. The primary focus of this thesis lies in the impact of Hungary`s territorial claims on British policy towards Hungary and Central Europe and upon the criteria Britain judged the territorial gains of Hungary between 1938 and 1941. This work is the result of the author`s research in British, American and Hungarian archives, along with his reflection on numerous documentary editions, diaries, memoirs and secondary sources. It aims to deepen our knowledge of Anglo-Hungarian relationship, British Central European policy and the British view of regional territorial disputes. At the same time, it is keen to dispel the myths and stereotypes of the British and Hungarian historiography, which have so far viewed Hungary as an unimportant factor in British Central European strategy.