Great Britain participated in the decision at the Potsdam Conference to hand over to Poland the territory of the former Free City of Danzig. The area was not recognized as part of Germany by the Great Powers. The aim of the article is to analyze the role that Gdańsk played in British policy towards Poland from the end of the Second World War to the fall of communist rule. It is based on archival research in the National Archives, Kew, supplemented by published British and Polish diplomatic documents, diaries and academic literature on the subject. Based on these sources, the author argues that the importance of the city of Gdańsk in British policy toward the region of East Central Europe diminished during the Cold War in comparison to the city’s role as the Free City of Danzig 1919–1939. However, its place was dynamic as Gdańsk became an important center of protests against the communist authorities in the 1970s and 1980s. The city played a special role since the strikes in August 1980, becoming the center of activity of the Solidarity Trade Union. The culmination of British interest was Margaret Thatcher’s visit to Gdańsk in 1988.