Members of the 1st Battalion Welsh Guards march past Britain's Queen Elizabeth II (L) and Emirati President Sheikh Khalifa bin Zayed al-Nahayan (obscured) during a ceremonial welcome in the grounds of Windsor Castle, in Berkshire, west of London on April 30, 2013. Sheikh Khalifa officially began a State visit to Britain with a cermonial welcome in Windsor hosted by the Queen and the Duke of Edinburgh. AFP PHOTO / POOL / BEN STANSALL *** Local Caption *** 020041-01-08.jpg
Queen Elizabeth II smiles at Prince Philip as they await the arrival of Sheikh Khalifa. Toby Melville / AFP Photo
David Cameron listens as Queen Elizabeth II delivers a speech at a State Luncheon on the first day of the state by Sheikh Khalifa bin Zayed at Windsor Castle. Oli Scarff / Pool / AFP Photo
Sheikh Khalifa waves as he leaves with the UAE delegation from No 10 Downing Street in Central London on May 1 following a meeting with Britain's Prime Minister David Cameron. Andrew Cowie / AFP Photo
Prince Andrew, the Duke of York, left, and John Hall, the Dean of Westminster Abbey. Ben Stansall / AFP Photo
Queen Elizabeth II and Prince Philip, the Duke of Edinburgh, greet Sheikh Khalifa bin Zayed, the President of UAE and Ruler of Abu Dhabi inside Windsor Castle in England on April 30. Oli Scarff / Getty Images
Prince Charles, the Prince of Wales meets Sheikh Khalifa during his visit to Clarence House. John Stillwell / Getty Images
Prince Charles and Sheikh Khalifa at Clarence House. John Stillwell / Getty Images
David Cameron, the UK prime minister, waits outside No 10 Downing Street for the arrival of the UAE delegation. Andrew Winning / Reuters
Britain Royals UAE
Britain's Queen Elizabeth II, and The Duke of Edinburgh await the arrival of Sheikh Khalifa. Kirsty Wigglesworth / AP Photo
Queen Elizabeth. Kirsty Wigglesworth / AP Photo
Emirati Sandhurst graduates Second Lt Mouza Khamis Al Nuaimi, the first ever female Sandhurst Emirati graduate, right, and First Lt Hamad Al Ameri at Westminster Abbey in London where they assisted Sheikh Khlaifa in laying a wreath at the Tomb of the Unk???
Sheikh Khalifa is welcomed by Very Rev Dr John Hall, the Dean of Westminster, right, and Prince Andrew, the Duke of York, left, as he arrives at Westminster Abbey in London. Stephen Lock for The National
Prince Philip takes part in a ceremonial welcome. Toby Melville / Reuters