Queen Elizabeth II: The Diamond Celebration: Produced in High Definition, with rare archive footage. Queen Elizabeth II has reigned for 60 years as the Queen of Great Britain and the Commonwealth. The Queen, who has witnessed incredible social, political and cultural changes in her reign, has retained the purpose and dignity of the British Monarchy. From the death of her father King George VI, to the marriage of Prince William and Kate Middleton, this is the true story of how the young Princess became a great Queen.