Allied war effort; Polish naval units were the first Polish forces to integrate with the Royal Navy under the "Peking Plan". Polish pilots played a conspicuous role in the Battle of Britain and the Polish army formed in Britain later participated in the Allied invasion of Nazi-occupied France. The great majority of Polish military veterans were stranded in Britain after the Soviet Union imposed communist control on Poland after the war. This particularly concerned Polish soldiers from eastern areas, which were no longer part of Poland as a result of border changes due to the Potsdam Agreement. The Polish government-in-exile, though denied majority international recognition after 1945, remained at its post in London until it formally dissolved in 1991, after a democratically elected president had taken office in Warsaw. The European Union's 2004 enlargement and the UK Government's decision to allow immigration from the new accession states, encouraged Polish people to move to Britain rather than to Germany. Additionally, the Polish diaspora in Britain includes descendants of the nearly 200,000 Polish people who had originally settled in Britain after the Second World War. About one-fifth had moved to settle in other parts of the British Empire. History A Polish cleric named John Laski (1499–1560), nephew of Jan Łaski (1456–1531), converted to Calvinism while in Basel, Switzerland, where he became an associate of Archbishop Cranmer. After moving to London, in 1550 he was superintendent of the Strangers' Church of London and had some influence on ecclesiastical affairs in the reign of Edward VI. Laski also spent some years working on the establishment of the Church of England. Shortly before his death, he was recalled to Poland's royal court. In the 16th century, when most grain imports to the British Isles came from Poland, Polish merchants and diplomats regularly travelled there, usually on the Eastland Company trade route from Gdańsk to London. Shakespeare mentions Polish people in his play Hamlet (e.g. "sledded polack"), which Israel Gollancz attributes to influence of the book, De optimo senatore (The Accomplished Senator), by Laurentius Grimaldius Goslicius (Wawrzyniec Grzymała Goślicki, a Polish bishop and noble). Gollancz further speculated that the book inspired Shakespeare to create the character Polonius, which is Latin for "Polish". After Poland's King John III, at the head of a coalition of European armies, defeated the invading Ottoman forces at the 1683 Ottoman siege of Vienna, a pub in London's Soho district was named