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A police convoy leaves Bow Street Court. Ian Ball, 26, of no fixed abode, was charged with attempting to murder Princess Anne's bodyguard, Inspector James Beaton, in Pall Mall. (Photo by PA Images via Getty Images)

A police convoy leaves Bow Street Court. Ian Ball, 26, of no fixed abode, was charged with attempting to murder Princess Anne's bodyguard, Inspector James Beaton, in Pall Mall.   (Photo by PA Images via Getty Images)