Britain's Prince Charles, Prince of Wales (R) and wife Camilla, Duchess of Cornwall (L) arrive for the annual Commonwealth Observance service at Westminster Abbey in central London on March 10, 2014. The annual Observance is marked by a multi-faith service at Westminster Abbey in honour of the Commonwealth of Nations, the organisation of 53 member states of which the queen is the head. This year's theme at the service celebrates Glasgow's hosting of the 2014 Commonwealth Games.  AFP PHOTO / BEN STANSALL        (Photo credit should read BEN STANSALL/AFP/Getty Images)