70 years ago today. BBC News - Service marks 70th anniversary of Battle of Britain Veterans from RAF Fighter Command are taking part in a ceremony to mark 70 years since the Battle of Britain. On 10 July 1940, the German Luftwaffe bombed London and south east England, but some 3,000 British airmen fought back and prevented a possible invasion. In a famous speech, Winston Churchill later said of their actions: "Never was so much owed by so many to so few." Prince Michael of Kent is at the service at the Battle of Britain memorial at Capel-le-Ferne near Dover. Thousands of people are expected to take part in the memorial service over the course of the day. Churchill called the battle Britain's finest hour and it helped change the course of World War II. Of "the few" that took part, it is thought that only about 100 veterans survive. For many in their 80s and 90s this could be the last major anniversary they attend. The Battle of Britain memorial stands on the white cliffs between Dover and Folkstone, and depicts a seated airman looking out over the sea towards France. Sunday's service sees Prince Michael, patron of the Battle of Britain Memorial Trust, joined by the Chief of the Air Staff, Air Chief Marshal Sir Stephen Dalton. A parade involving veterans and modern-day air cadets, as well as a minute's silence and a wreath-laying was also held. The service saw a fly-past by a Spitfire and Lancaster Bomber from the Battle of Britain Memorial Flight. The Spitfire involved was the oldest airworthy one in the world and the only one to take part in the Battle of Britain. Group Captain Patrick Tootal, secretary of the Memorial Trust, said: "The Battle of Britain was, for this country, arguably the most important battle of the 20th century. "We pay tribute each July to the men of RAF Fighter Command - 'The Few' - who were at the forefront of preventing a possible German invasion, as well as to the many men and women who supported them and helped to ensure that we all live in freedom today." Critical battle that we hung on in to win, another one of the many points where a defeat might have been the end for us.