The King's Speech - what is it and why is it important?

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It's one of the most elaborate and historic ceremonies in parliament - a part of the UK's unwritten constitution with traditions dating back to the 17th century. The State Opening of Parliament marks the beginning of a parliamentary session – and usually happens once a year. The BBC's political correspondent, Harry Farley, has this handy guide on what we can expect from the King's Speech. (Image: BBC)