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Surprise royal guests join Diamond Jubilee street party

3 June 2012 Last updated at 13:37 BST

Well-wishers greeted the Duke and Duchess of Cornwall at a street party in Piccadilly, central London, where 500 tables were set up for a Diamond Jubilee celebration lunch.

The royal couple were surprise visitors at the event.

The Big Jubilee Lunch is encouraging people to share food with neighbours and friends in street parties and picnics.

The BBC's Sangita Myska reports.