David Cameron has begun a meeting with US President Barack Obama in the White House.
The Prime Minister is in America to highlight the benefits of a free trade deal between the EU and US.
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Showers could be heavy for a time but most should still enjoy sunny spells.
The chief executive of EDF has urged the government to go ahead with the new nuclear plant.
An Italian prosecutor investigating the quake aftermath believes cheap renovations may be partly to blame for the high death toll.