LONDON, ENGLAND - FEBRUARY 15:  'Larry', the new Downing Street cat, at Number 10 Downing Street on February 15, 2011 in London, England. It is hoped that British Prime Minister David Cameron's newest team member Larry, will dispense of a rat that has been spotted scuttling past the famous door of Number 10 Downing Street in recent weeks.  (Photo by Mark Large - WPA Pool / Getty Images)