Count Edward Raczynski - Lennox Gardens, London, UK - Blue Plaques on Waymarking.com

The full wording on the English Heritage blue plaque reads:

English Heritage

Count
Edward
Raczynski
1891 - 1993
Polish Statesman
lived here
1967 - 1993

The Encyclopaedia Britannica website has an article about Count Raczynski that tells us:

Count Edward Bernard André Maria Raczynski, (born Dec. 19, 1891, Zakopane, Poland—died July 30, 1993, London, England) Polish diplomat who , was a central figure in the Polish government-in-exile based in London during and after World War II; he eventually served one term as president-in-exile (1979-86). Raczynski, the son of a wealthy nobleman, was educated at the London School of Economics and the Universities of Krakow and Leipzig. He joined the Polish foreign service in 1919 and was a delegate to the 1932-34 disarmament conference in Geneva. As ambassador to the court of St. James’s (1934-45), he signed the Anglo-Polish pact that brought the U.K. into the war when Poland was invaded in 1939. Raczynski served in the Polish government-in-exile as foreign minister (1941-43), but he refused to join the postwar communist government established in Warsaw as a consequence of the 1945 Yalta Conference. He remained active in émigré politics as an adviser to the British government and as chairman (1940-67) of the Polish Research Centre in London. Raczynski published his wartime diaries in English in 1963 and wrote several volumes of poetry and reminiscences in Polish.