A KEY suspect in the alleged plot to mount an attack in Germany on the scale of 9/11 is on the run in Britain, German security officials disclosed yesterday. Scotland Yard counterterrorism detectives are hunting the man, who escaped from Germany after a plot to explode bombs at Frankfurt airport and a US airbase. The collective power of the bombs would have exceeded those in Madrid and London in 2004 and 2005. The plot was foiled on September 4 when three men were arrested at a rented holiday apartment near the central German town of Kassel. Police recovered chemicals and...