London 2012 Olympic Games: Dow Chemicals controversy: Press conference

London 2012 Olympic Games: Dow Chemicals controversy: Press conference; ENGLAND: London: Stratford: EXT Helicopter flying past London 2012 Olympic Stadium / Workers and machinery along inside Stadium / Stadium and Arcelor Mittal Orbit sculpture / Security fence around site / Security cameron mounted on pole / Digger along outside Stadium / Stadium and Arcelor Mittal Orbit sculpture beside at partially completed site / GVs Security fence / Machinery seen through opening inside Stadium / Stadium and sculpture with construction vehicles along / More security fence with razor wire / Security cameras mounted on pole