A schoolboy bows to Britain's Queen Elizabeth II in front of a display as she vists Dersingham Infant and Nursery School in Dersingham, Norfolk, on February 6, 2012 to mark the start of her diamond jubilee celebrations. Queen Elizabeth II renewed her vow to serve on February 6 as she made a low-key start to five months of diamond jubilee celebrations marking her 60 years on the throne. AFP PHOTO / POOL / ARTHUR EDWARDS

Three-year-old pupil Isaac Minns (R) plays up for the camera as Britain's Queen Elizabeth II (L) vists Dersingham Infant and Nursery School in Dersingham, Norfolk, on February 6, 2012 to mark the start of her diamond jubilee celebrations. Queen Elizabeth II renewed her vow to serve on February 6 as she made a low-key start to five months of diamond jubilee celebrations marking her 60 years on the throne. AFP PHOTO / POOL / ARTHUR EDWARDS

Britain's Queen Elizabeth II (L) looks at a display during a vist to the Dersingham Infant and Nursery School in Dersingham, Norfolk, on February 6, 2012 to mark the start of her diamond jubilee celebrations. Queen Elizabeth II renewed her vow to serve on February 6 as she made a low-key start to five months of diamond jubilee celebrations marking her 60 years on the throne. AFP PHOTO / POOL / ARTHUR EDWARDS

Headteacher Gayle Platt (L) sits with Britain's Queen Elizabeth II (R) as she visits Dersingham Infant and Nursery School in Dersingham, Norfolk, on February 6, 2012 to mark the start of her diamond jubilee celebrations. Queen Elizabeth II renewed her vow to serve on February 6 as she made a low-key start to five months of diamond jubilee celebrations marking her 60 years on the throne. AFP PHOTO / POOL / ARTHUR EDWARDS

Britain's Prince Michael of Kent joins soldiers of the Honorable Artillery Company in a 62 gun salute at the Tower of London in front of Tower Bridge on February 6, 2012, to mark the start of diamond jubilee celebrations for Britain's Queen Elizabeth II. Queen Elizabeth II renewed her vow to serve on Monday as she made a low-key start to five months of diamond jubilee celebrations marking her 60 years on the throne. AFP PHOTO / JUSTIN TALLIS