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Blue Peter - 18/11/2008

Logo for Blue Peter - 18/11/2008

Helen gets an exclusive look behind the scenes at Heathrow Terminal 5 and Joel faces one of the toughest endurance courses ever with the Royal Marines - will he beat their record time? To get involved in this year's Blue Peter Appeal "Mission Nutrition" check out the Blue Peter website at bbc.co.uk/cbbc.