King Edward made the first broadcast of his reign when he spoke to the Empire and the world from Studio 3b at Braodcasting House , London . The speech was relayed throughout the Empire , the Continent , South America and the United States and it is estimated 600 million people heard this broadcast . Although this was the first since his accession . King Edward has broadcast 75 times . Seen here King Edward at the microphone during his world braodcast . 1 March 1936