“Even though large tracts of Europe and many old and famous states have fallen or may fall into the grip of the Gestapo and all the odious apparatus of Nazi rule, we shall not flag or fail. We shall go on to the end, we shall fight in France, we shall fight on the seas and oceans, we shall fight with growing confidence and growing strength in the air, we shall defend our island, whatever the cost may be, we shall fight on the beaches, we shall fight on the landing grounds, we shall fight in the fields and in the streets, we shall fight in the hills; we shall never surrender.”
However, Smithsonian writes that the most surprising thing, is that Churchill’s speech was not broadcast over the radio to the British public, and that most Britons and Americans did not hear the speech until decades later. And the recording that has been heard round the world was actually recorded in 1949, from the comfort of his own home. The House of Commons was not wired for sound in 1940, so any public broadcast would have to be delivered again, specifically for radio. But Churchill was too busy and uninterested to do this, and so radio journalists just reported his words on the air.
During the 1930s Churchill expressed growing concern over the resurgence of German nationalism. After Adolf Hitler assumed power in 1933, the former sea lord urged strengthening the Royal Navy, but few Britons heeded him. However, as the German Führer went from success to success, it became apparent that Nazi ambition could not be contained. Churchill had only contempt for appeasers like Prime Minister Neville Chamberlain and U.S. ambassador Joseph Kennedy, but with declaration of war in September 1939 Churchill the warhorse felt justified in returning to harness. When he resumed his position as First Sea Lord after twenty-four years, the Admiralty signaled the fleet, ‘‘Winston is back.’’ 

The essence of good House of Commons speaking is the conversational style, the facility for quick, informal interruptions and interchanges. Harangues from a rostrum would be a bad substitute for the conversational style in which so much of our business is done. But the conversational style requires a fairly small space, and there should be on great occasions a sense of crowd and urgency. There should be a sense of the importance of much that is said and a sense that great matters are being decided, there and then, by the House. ... It has a collective personality which enjoys the regard of the public, and which imposes itself upon the conduct not only of individual Members but of parties.
The Admiralty had demanded six ships: the economists offered four: and we finally compromised on eight.” Churchill believed that Germany was badly overextending itself, having doubled its national debt over the previous ten years. Germany was rapidly approaching its limits, he thought, though he allowed for the possibility that it might pursue foreign adventurism as an answer for its economic problems. In a memorandum to the cabinet in 1909, Churchill mused, “ . . . a period of internal strain approaches in Germany. Will the tension be relieved by moderation or snapped by calculated violence? . . . . [O]ne of the two courses must be taken soon.” This was, Churchill wrote later in The World Crisis, “the first sinister impression that I was ever led to record.”
The term “Iron Curtain” defined the Soviet tyranny that extended its grasp over Eastern Europe. Although the public came to know the phrase from Churchill’s Fulton speech, he had first used it in a telegram to Truman the preceding May, days after the German surrender but before the two leaders met for the first time at the Potsdam conference. “I am profoundly concerned about the European situation,” Churchill wrote. “An iron curtain is being drawn down upon their front,” he wrote of the Soviet forces settling down in Eastern European nations. “We do not know what is going on behind . . . . Meanwhile the attention of our peoples will be occupied in inflicting severities on Germany, which is ruined and prostrate, and it would be open to the Russians in a very short time to advance if they chose to the waters of the North Sea and the Atlantic.”
Where I put “Commons” in brackets following the speech title, it of course indicates that the speech was recorded by Churchill subsequent to its date of delivery in the House, as there was no audio recording of Commons proceedings in Churchill’s day.  That first occurred on 3 April 1978, long after Churchill’s days in Parliament.  I add, as a point of interest, the fact that video broadcasts of proceedings on the floor of the House began on 21 November 1989.
What is important is that the version found on the BBC’s ‘School Radio’ site is the one used in documentaries, such as ITV’s 1973–4 World at War series. It is the version that people, including those who listened to the actual broadcast, think of when they think of this speech. But is it what the British people heard in the summer of 1940? There are hints here and there that Churchill ‘re-recorded’ some of his wartime speeches for Decca Records around 1949. Strangely, none of Churchill’s biographers mention this, and neither does Toye. More’s the pity. It is a mystery that, if solved, could help explain why reactions to Churchill’s broadcasts when they were given differ from the impressions we have of them today.  
On June 18, 1940, Churchill attempted to lift up England following the fall of France and the successful evacuation of most of England’s supporting forces from the continent. At the moment of great apparent danger to British national survival, he spoke not only of endurance but of noble causes of which Britain was fighting (freedom, Christian civilization, the rights of small nations): “Let us therefore brace ourselves to our duties, and so bear ourselves, that if the British Empire and its Commonwealth last for a thousand years, men will still say, ‘This was their finest hour.’” The speech lasted thirty-six minutes. The final passage of his typescript was laid out in blank verse format, which historians believe shows the influence of the Old Testament psalms on Churchill’s oratorical style.

One of the persistent misconceptions of Churchill is that he was a poor student. It is more accurate to say he was, by his own admission, a rebellious student, often bored with the curriculum and chafing under the standard teaching methods of the time. It was obvious from his earliest days in school that he was extremely bright and facile with the English language, a prodigy at learning history and extending its lessons. Still, he was often “on report,” or ranked near the bottom of his class at the end of the term.

What is important is that the version found on the BBC’s ‘School Radio’ site is the one used in documentaries, such as ITV’s 1973–4 World at War series. It is the version that people, including those who listened to the actual broadcast, think of when they think of this speech. But is it what the British people heard in the summer of 1940? There are hints here and there that Churchill ‘re-recorded’ some of his wartime speeches for Decca Records around 1949. Strangely, none of Churchill’s biographers mention this, and neither does Toye. More’s the pity. It is a mystery that, if solved, could help explain why reactions to Churchill’s broadcasts when they were given differ from the impressions we have of them today.  
The young Churchill passed an unhappy and sadly neglected childhood, redeemed only by the affection of Mrs. Everest, his devoted nurse. At Harrow his conspicuously poor academic record seemingly justified his father’s decision to enter him into an army career. It was only at the third attempt that he managed to pass the entrance examination to the Royal Military College, now Academy, Sandhurst, but, once there, he applied himself seriously and passed out (graduated) 20th in a class of 130. In 1895, the year of his father’s tragic death, he entered the 4th Hussars. Initially the only prospect of action was in Cuba, where he spent a couple of months of leave reporting the Cuban war of independence from Spain for the Daily Graphic (London). In 1896 his regiment went to India, where he saw service as both soldier and journalist on the North-West Frontier (1897). Expanded as The Story of the Malakand Field Force (1898), his dispatches attracted such wide attention as to launch him on the career of authorship that he intermittently pursued throughout his life. In 1897–98 he wrote Savrola (1900), a Ruritanian romance, and got himself attached to Lord Kitchener’s Nile expeditionary force in the same dual role of soldier and correspondent. The River War (1899) brilliantly describes the campaign.
Churchill persevered and worked on his pronunciation diligently, rehearsing phrases such as “The Spanish ships I cannot see for they are not in sight”. He tried to avoid words beginning and ending with an ‘s’, but when he did, his pronunciation became a part of his intonation and oratory, later mispronouncing “Nazis” as “Narzees” to great effect and advantage.
In Churchill’s veins ran the blood of both of the English-speaking peoples whose unity, in peace and war, it was to be a constant purpose of his to promote. Through his father, Lord Randolph Churchill, the meteoric Tory politician, he was directly descended from John Churchill, 1st duke of Marlborough, the hero of the wars against Louis XIV of France in the early 18th century. His mother, Jennie Jerome, a noted beauty, was the daughter of a New York financier and horse racing enthusiast, Leonard W. Jerome.
The Churchill Estate (as well as British Institutions like BBC, British Library and British Pathe that don't allow downloads) are extremely possessive of archive material. There is a substantial amount of British pre-1950 spoken word recordings from the arts, to politicians to royalty - nearly all were put onto 78s for public consumption, so it's OUR heritage. Yet there's no single accessible source for them - they're spread all over the place, so it's good that these Churchill recordings, at least, are freely available.
Oddly enough, some people believe that they did hear it on the radio though. Nella Last, a British housewife who kept diaries during the war, wrote in 1947, “I remember that husky, rather stuttering voice acclaiming that we would ‘fight on the beaches, on the streets. I felt my head rise as if galvanised and a feeling that ‘I’ll be there — count on me; I’ll not fail you.'” Even a Dunkirk soldier thought he had heard the speech, writes Smithsonian. Some began to think they heard an impersonator deliver the words.
With Chamberlain’s policies and moral authority irrefutably discredited, Churchill became prime minister on 10 May 1940. Immediately faced with the fall of France and the possible invasion of England, Churchill directed his immense energy and ability to defense of Shakespeare’s ‘‘scepter’d isle.’’ He shrugged off suggestions by some right-wing politicians and allegedly a few members of the royal family to reach an accommodation with Hitler. Through the summer and fall the Battle of Britain was fought and won in English skies, and the Nazi invasion fleet—such as it was—never sailed. Churchill’s masterful oratory gripped the world’s attention in concert with the epic events unfolding about him.
Public opinion surveys were conducted during the war by the Gallup organization and these, too, show widespread support for Churchill. Yet, Toye by and large dismisses these findings by noting that questions have been raised about the polls’ methodology. Beyond that, he argues that, especially during the war’s early years, there was a lot of pressure to conform, to give ‘socially acceptable’ answers (p. 7). Why Toye believes that average Britons would have been any more honest when interviewed by an official from the MoI’s Home Intelligence Division (a government agency after all), or why they would have been more open with MO interviewers or, even in diaries handed over to these same strangers, he does not say. Even after making allowances for sampling errors and the like, the fact remains that Churchill’s popularity during the war was, in Toye’s own words, ‘astonishingly high’ (p. 6). This was still the case when large discrepancies appeared between Churchill’s MO ‘satisfaction figures’ of 66 per cent, and a Gallup approval rating of 81 per cent for the same month (p. 228). That month, March 1942, happened to be one of the worst of the war: British forces were reeling under hammer blows from the Japanese, including the loss of Singapore just weeks earlier; Axis forces threatened Egypt; and German U-boats were winning the Battle of the Atlantic. What is astonishing is not the gap between these surveys of public opinion but that they were still so high despite this string of disasters.
The speech takes on an inexorable rhythm, which coupled with the use of repetition, acquires a kind of imperial power reminiscent of Shakespeare. The extraordinary potency of these words transformed the nation. It filled everyone who heard it with faith and conviction, and it enabled our small island to withstand pure evil. It somehow reaches into the very soul of England and calls up that lion spirit which lies dormant within every English heart.
Churchill drew on suggestions from his private secretaries, colleagues, and cabinet in the shaping of his speech. Richard Toye, in his book The Roar of the Lion: The Untold Story of Churchill’s World War II Speeches, cites a memo from American newspaper editor William Philip Simms that appears to have been particularly influential. Simms wrote that Churchill should convey “come what may, Britain will not flinch,” and emphasized, “Give in -- NEVER!” Churchill considered comments from his cabinet that he was being too hard on France in his speech, but he was more concerned with offending American listeners, deleting a line about the United States’s “strange detachment” from the draft, erring on the side of subtlety. 

Of this I am quite sure, that if we open a quarrel between the past and the present, we shall find that we have lost the future. Therefore, I cannot accept the drawing of any distinctions between members of the present Government. It was formed at a moment of crisis in order to unite all the Parties and all sections of opinion. It has received the almost unanimous support of both Houses of Parliament. Its members are going to stand together, and, subject to the authority of the House of Commons, we are going to govern the country and fight the war. It is absolutely necessary at a time like this that every Minister who tries each day to do his duty shall be respected; and their subordinates must know that their chiefs are not threatened men, men who are here today and gone tomorrow, but that their directions must be punctually and faithfully obeyed. Without this concentrated power we cannot face what lies before us. I should not think it would be very advantageous for the House to prolong this debate this afternoon under conditions of public stress. Many facts are not clear that will be clear in a short time. We are to have a secret session on Thursday, and I should think that would be a better opportunity for the many earnest expressions of opinion which members will desire to make and for the House to discuss vital matters without having everything read the next morning by our dangerous foes.