By Guy Faulconbridge and Kate Holton LONDON (Reuters) - Margaret Thatcher, the "Iron Lady" who transformed Britain and inspired conservatives around the world by radically rolling back the state during her 11 years in power, died on Monday following a stroke. She was 87. Britain's only woman prime minister, the unyielding, outspoken Thatcher led the Conservatives to three election victories, governing from 1979 to 1990, the longest continuous period in office by a British premier since the early 19th century. ...