The Harlow MP Robert Halfon was praised by the Chancellor George Osborne for campaigning for a measure in the Budget to scrap the fuel duty rise scheduled for September.
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The 34-year-old from Coulsdon in Surrey died during the private party in Headley in the early hours of Monday, Surrey Police said.
The Home Office made the arrests at various restaurants across London on July 4.
Mayor of Newham Sir Robin Wales criticised the International Olympic Committee on the fourth anniversary of the opening ceremony.