Bells pealed out across Britain and the Olympic flame travelled down the River Thames in the sumptuous royal barge, as London made its final countdown to the opening ceremony.  The Olympic torch was rowed on Friday along the Thames onboard the Gloriana, Queen Elizabeth II's vast red and gold barge, on the last day of its 10-week, 12,800-kilometre relay around Britain and Ireland.  Emma Hayward was in London to witness the excitement along the Thames.