A consistent theme of the reign of Queen Elizabeth II has been her abiding interest and dedication to the Commonwealth. As its symbolic head, she has overseen the transition from Empire to a 'family of nations', with an enthusiasm bordering on devotion. Despite frequent predictions of the Commonwealth, the Queen has played a central role in keeping it not just alive, but relevant. So, why is the Queen co committed to this disparate association - and how does she retain the allegiance of the heads of member states? Features exclusive, recently conducted interviews with Lord St. John of Fawsley, Simon Heffer, Andrew Roberts, Andrew Pierce and Nick Owen.