Afterv 60 years on the throne Queen Elizabeth II celebrates her Diamond Jubilee in 2012. The sixth queen regnant and 63rd sovereign of Britain Elizabeth II can trace her ancestry beyond the Hanoverians, Stuarts, Tudors, Plantagencts and Normans, back to the Saxon kings of the Dark Ages. Throughout the many personal turbulence of her reign, the Queen has remained faultless in her public duties at home and abroad. As constitutional monarch, she has advised twelve Prime Ministers, from Churchill to Cameron. As head of state, she has travelled widely at the request of the British government of the day. She is Queen in sixteen countries as well as being Head of the Commonwealth, a free association of 53 countries. With interviews from key royal observers and friends including Sarah Bradford, Andrew Morton, Dr David Starkey and Brian Hoey, Sixty Years On is made by the same production team that has made no less than 35 royal documentaries, co-produced with BBC Worldwide, ITV and Universal Television.