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LONDON - APRIL 26: Queen Elizabeth II attends the unveiling of the National Police Memorial, April 25 2005 in London, England. The memorial was designed by Sir Norman Foster and work began in June following planning permission being granted by Westminster Council. Michael Winner formed the Police Memorial Trust after the shooting of PC Yvonne Fletcher outside the Libyan embassy in 1984. (Photo by MJ Kim/Getty Images)

LONDON - APRIL 26: Queen Elizabeth II attends the unveiling of the National Police Memorial, April 25 2005 in London, England. The memorial was designed by Sir Norman Foster and work began in June following planning permission being granted by Westminster Council. Michael Winner formed the Police Memorial Trust after the shooting of PC Yvonne Fletcher outside the Libyan embassy in 1984.   (Photo by MJ Kim/Getty Images)