The officer - a member of Scotland Yard's Diplomatic Protection Group, SO6 - reported the incident to his superiors.

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That the new Conservative Chief Whip, Andrew Mitchell, lost his temper with a member of Scotland Yard's Diplomatic Protection Group, is not in dispute.

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The investigations were overseen by the Article 29 Working Party, a group of representatives from each member state tasked with promoting the application of the EU's Data Protection Directive.

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