Question: Who is the Prime Minister of the United Kingdom whose book a thesis by John F Kennedy alludes to?

full_context: Document 1: Why England Slept: Why England Slept is the published version of a thesis written by John F. Kennedy while in his senior year at Harvard College. Its title was an allusion to Winston Churchill's 1938 book "While England Slept", which also examined the buildup of German power. Published in 1940, the book examines the failures of the British government to take steps to prevent World War II and is notable for its uncommon stance of not castigating the appeasement policy of the British government at the time, instead suggesting that an earlier confrontation between the United Kingdom and Nazi Germany could well have been more disastrous in the long run.
Document 2: Clement Attlee: Clement Richard Attlee, 1st Earl Attlee, {'1': ", '2': ", '3': ", '4': "} (3 January 1883 – 8 October 1967) was a British Labour politician who served as Prime Minister of the United Kingdom from 1945 to 1951 and Leader of the Labour Party from 1935 to 1955. In 1940, Attlee took Labour into the wartime coalition government and served under Winston Churchill, becoming the first person to hold the office of Deputy Prime Minister of the United Kingdom. He went on to lead the Labour Party to an unexpected landslide victory at the 1945 general election; forming the first Labour majority government, and a mandate to implement its postwar reforms. The 12.0% national swing from the Conservatives to Labour was unprecedented at that time and remains the largest ever achieved by any party at a general election in British electoral history. He was re-elected with a narrow majority at the 1950 general election. In the following year, Attlee called a snap general election, hoping to increase his parliamentary majority. However, he was narrowly defeated by the Conservatives under the leadership of Winston Churchill; despite winning the most votes of any political party in any general election in British political history until the Conservative Party's fourth consecutive victory in 1992. Attlee remains the longest-ever serving Leader of the Labour Party.
Document 3: JFK and the Unspeakable: JFK and the Unspeakable: Why He Died and Why It Matters is a book by theologian and Catholic Worker James W. Douglass (Orbis Books, 2008; Touchstone Books, an imprint of Simon & Schuster, 2010) that analyzes the presidency of John F. Kennedy as well as the events surrounding the assassination of John F. Kennedy. The book is drawn from many sources, including the Warren Report. The book's central thesis is that Kennedy was a cold warrior who turned to peace-making, and that as a result he was killed by his own security apparatus.
Document 4: Later life of Winston Churchill: The later life of Winston Churchill documents the life of the British statesman from the end of World War II and his second term as Prime Minister of the United Kingdom, until his subsequent death and funeral in 1965. After the end of the war Churchill had to step down as Prime Minister of the United Kingdom because the Conservative Party lost the 1945 election. For six years he was to serve as the Leader of the Opposition. During these years Churchill continued to influence world affairs; in 1946 he gave his Iron Curtain speech which spoke of the expansionist policies of the USSR and the creation of the Eastern Bloc; Churchill also argued strongly for British independence from the European Coal and Steel Community (which he saw as a Franco-German project as Britain still had an empire). In the General Election of 1951 Labour was defeated and Churchill became Prime Minister for a second time. Churchill continued to lead Britain but was to suffer increasingly from health problems. Aware that he was slowing down both physically and mentally he resigned from the Cabinet in 1955. However he continued to sit as an MP for Woodford until he retired from politics in 1964. Churchill died on 24 January 1965 and was granted the honour of a state funeral. He was buried in his family plot in St Martin's Church, Bladon near to where he was born at Blenheim Palace.
Document 5: Stopped at Stalingrad: Stopped at Stalingrad: The Luftwaffe and Hitler's Defeat in the East, 1942-1943 is a book that analyzed the role of Hitler's use and control of the Luftwaffe in the Battle of Stalingrad between Nazi Germany and the Soviet Union during World War II. Written by New Zealand-born British scholar Joel S. A. Hayward, it discusses at length the various reasons for Hitler's invasion, the consequences, the major battles of the Eastern Front and the role of the Luftwaffe in these areas, along with the hierarchy of the Luftwaffe itself. The book deals with how Hitler's control of the Luftwaffe during this battle ultimately led to the German loss at the Battle of Stalingrad, the turning point against the Germans in World War II.
Document 6: The Second World War (book): The Second World War is a narrative history of World War II by British historian Antony Beevor. The book starts with the Japanese invasion of Manchuria in 1931, and covers the entire Second World War ending with the final surrender of Axis forces.
Document 7: The Origins of the Second World War: The Origins of the Second World War is a non-fiction book by the English historian A. J. P. Taylor, examining the causes of World War II. It was first published in 1961 by Hamish Hamilton.
Document 8: Blood, Tears and Folly: Blood, Tears and Folly: An Objective Look at World War II is a 1993 book by Len Deighton published by Jonathan Cape. It is a history of World War II from an alternative viewpoint. Deighton looks for the origins of the war in previous history, from the rise of the great power conflicts that led to the First World War, through the inter-war years, and the histories of the various conflicts and combatants in the years up until the Second World War's outbreak in 1939.
Document 9: Winston Churchill (Cavalier): Sir Winston Churchill, FRS (18 April 1620 – 26 March 1688), known as the "Cavalier Colonel", was a British soldier, nobleman, historian, and politician. He was the father of John Churchill, 1st Duke of Marlborough, as well as an ancestor of his 20th-century namesake, Prime Minister Sir Winston Churchill.
Document 10: Descendants of Winston Churchill: Sir Winston Churchill, son of Lord Randolph Churchill and grandson of John Spencer-Churchill, 7th Duke of Marlborough, was Prime Minister of the United Kingdom between 26 October 1951 – 6 April 1955 and 10 May 1940 – 26 July 1945. In 1908, Churchill married Clementine Hozier, the daughter of Sir Henry and Lady Blanche Hozier. By Clementine, Churchill had five children and ten grandchildren, a number of whom are well known in their own right.
Document 11: Winston Churchill (1940–2010): Winston Spencer-Churchill (10 October 1940 – 2 March 2010), generally known as Winston Churchill, was a British Conservative Party politician and a grandson of former Prime Minister Sir Winston Churchill. During the period of his prominence as a public figure, he was normally referred to as Winston Churchill, MP, in order to distinguish him from his grandfather. His father Randolph Churchill was also an MP.
Document 12: Bust of Winston Churchill (Epstein): Jacob Epstein's bronze bust of Winston Churchill was completed in 1947. Epstein was commissioned by the War Artists Advisory Committee to create a sculpture of former British Prime Minister Winston Churchill in August 1945, after the end of the Second World War and shortly after Churchill lost the 1945 UK general election. Two casts have been displayed in the Oval Office.
Document 13: Neville Chamberlain: Arthur Neville Chamberlain, ( ; 18 March 1869 – 9 November 1940) was a British Conservative politician who served as Prime Minister of the United Kingdom from May 1937 to May 1940. Chamberlain is best known for his appeasement foreign policy, and in particular for his signing of the Munich Agreement in 1938, conceding the German-speaking Sudetenland region of Czechoslovakia to Germany. However, when Adolf Hitler later invaded Poland, the UK declared war on Germany on 3 September 1939, and Chamberlain led Britain through the first eight months of World War II.
Document 14: Winston Churchill: Sir Winston Leonard Spencer-Churchill, {'1': ", '2': ", '3': ", '4': "} (30 November 187424 January 1965) was a British statesman, army officer, and writer. He served as Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As a Member of Parliament (MP), he represented five constituencies over the course of his career. As Prime Minister, Churchill led Britain to victory during World War II. He led the Conservative Party for fifteen years from 1940 to 1955.
Document 15: Zweites Buch: The Zweites Buch (] , "Second Book"), unofficially published in English as Hitler's Secret Book and then officially Hitler's Second Book, is an unedited transcript of Adolf Hitler's thoughts on foreign policy written in 1928; it was written after "Mein Kampf" and was not published in his lifetime. The "Zweites Buch" was not published in 1928 because "Mein Kampf" did not sell well at that time and Hitler's publisher, Franz-Eher-Verlag, told Hitler that a second book would hinder sales even more.
ground_truth: Winston Churchill