The article reveals mutual relationships between Great Britain and Poland on the verge of the Second World War based on the British National Archives documents. The authors acknowledge principles of the British foreign policy towards Poland and the activity of its diplomatic corps along with the War Cabinet. The paper determines that diplomatic and military-political relations between Great Britain and Poland have been multidimensional with deep historical roots.
 The article represents the analysis of the main misunderstandings and challenges that determined British-Polish relations before and at the beginning of the Second World War. Sequentially, the British position and interest regarding the establishment of the strategic military partnership with Poland are shown. The authors examined British-Polish agreements that were signed during the spring-summer period of 1939 in order to designate the nature of the negotiation process between the states.
 The publication also reveals the reasons for a weak practical element of the negotiation process, emphasising the difficulties concerning the Royal force on the European continent deployed on the Polish border. Also, the authors analyse scenarios of the counteractions towards the aggressive steps of Germany and search for the mechanisms of the aggression deterrence considering different dynamics of the events. It is stated that along with the British influence regarding the situation in Poland, either France took an active part in the decision-making process.
 Based on the documents from the British National Archives, the authors established that diplomatic commentaries and reports written by ambassadors and state officials with regards to German actions on the Polish territories on the verge of the Second World War. Emphasising the cruel legacy of the Nazi regime, the rapid nature of German army attacks and brutal treatment towards the Polish population in the first days of September 1939 are described.
 The authors concluded that actions of the British political and military circuits concerning aid to Poland at the start of the Second World War seem to have been inconsistent, unconfident and did not bring strategic effect.
 After the Nazi occupation of Poland, British authorities had to change their approaches to the realisation of British-Polish relations. London accepted the idea of recognition of Polish emigrated government officials headed by V. Sikorsky, providing them with substantial empowerment to the Non-Aligned Movement.
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