Passage: During 1951, George VI's health declined, and Elizabeth frequently stood in for him at public events. When she toured Canada and visited President Harry S. Truman in Washington, D.C., in October 1951, her private secretary, Martin Charteris, carried a draft accession declaration in case the King died while she was on tour. In early 1952, Elizabeth and Philip set out for a tour of Australia and New Zealand by way of Kenya. On 6 February 1952, they had just returned to their Kenyan home, Sagana Lodge, after a night spent at Treetops Hotel, when word arrived of the death of the King and consequently Elizabeth's immediate accession to the throne. Philip broke the news to the new queen. Martin Charteris asked her to choose a regnal name; she chose to remain Elizabeth, "of course". She was proclaimed queen throughout her realms and the royal party hastily returned to the United Kingdom. She and the Duke of Edinburgh moved into Buckingham Palace.With Elizabeth's accession, it seemed probable the royal house would bear her husband's name, in line with the custom of a wife taking her husband's surname on marriage. The Duke of Edinburgh's uncle, Lord Mountbatten, advocated the name House of Mountbatten.  Philip suggested House of Edinburgh, after his ducal title. The British Prime Minister, Winston Churchill, and Elizabeth's grandmother, Queen Mary, favoured the retention of the House of Windsor, and so on 9 April 1952 Elizabeth issued a declaration that Windsor would continue to be the name of the royal house. The Duke complained, "I am the only man in the country not allowed to give his name to his own children." In 1960, after the death of Queen Mary in 1953 and the resignation of Churchill in 1955, the surname Mountbatten-Windsor was adopted for Philip and Elizabeth's male-line descendants who do not carry royal titles.Amid preparations for the coronation, Princess Margaret told her sister she wished to marry Peter Townsend, a divorcé‚ 16 years Margaret's senior, with two sons from his previous marriage. The Queen...

Question: Who was the successor to the highest position following the King's death?
Elizabeth