By Will Stewart & Antony Thrower A Father Christmas fell to his death from the top of a high-rise building in front of shocked children as a stunt went tragically wrong. The climber, dressed as the Russian Santa Claus known as Grandfather Frost, had intended to climb down the building on ropes and greet the youngsters below as a magical surprise. Instead, those gathered around the Christmas tree below including his own child and partner, watched in horror as he fell more than 240ft to his death in the Russian city Chelyabinsk. Many thought the fall was part of the act and did not realise he ha…