French President Nicolas Sarkozy, left, and his wife Carla Bruni Sarkozy, centre, say farewell to Queen Elizabeth II, right, and Prince Philip, Duke of Edinburgh, rear, as they leave Windsor castle for London Thursday March 27, 2008. Britain and France are expected Thursday to seal an agreement on co-operation in the development of a new generation of nuclear power stations in the United Kingdom. The issue of nuclear power will top the agenda at a UK-France summit between Gordon Brown and Nicolas Sarkozy on the second and final day of the French President's state visit. (AP Photo/Lewis Whyld, Pool)

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