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A quick tidy-up before the Queen comes over for lunch

Assisted by a policeman, a worker uses a feather duster to clean a lantern outside the door of Number 10 Downing Street on July 24, 2012 in London, England. British Prime Minister David Cameron is due to host a lunch at Downing Street for Her Majesty the Queen and the Duke of Edinburgh as well as past Prime Ministers Sir John Major, Tony Blair and Gordon Brown.